以下の内容はhttps://pod.hatenablog.com/entry/2020/02/22/223610より取得しました。

prestringがasync/awaitをサポートした

python prestring asyncio

github.com

prestringがasync/awaitをサポートした。

（そしてしれっとmypyで型をつけた（実はこちらのほうが大変だった））

prestring?

prestringは文字列を生成するためのライブラリ。with構文を乱用している。

例えば以下の様なコードが

00main.py

from prestring.python import Module

m = Module()

with m.def_("main"):
    m.stmt("print('hello world')")

with m.if_("__name__ == '__main__'"):
    m.stmt("main()")

print(m)

以下の様なコードを出力する。

def main():
    print('hello world')


if __name__ == '__main__':
    main()

なのでプロセス置換を使って実行してあげれば"hello world"を出力する。

$ python <(python 00main.py)
hello world

prestring.transform

自分の手で書くのがめんどうなら python -m prestring.python にソースコードを渡してあげると、そのコードを生成するコードを出力してくれる。

例えば以下の様なコードを渡してみる。

01fizzbuzz.py

def fizzbuzz(n: int) -> str:
    if n % 3 == 0 and n % 5 == 0:
        return "fizzbuzz"
    elif n % 3 == 0:
        return "fizz"
    elif n % 5 == 0:
        return "buzz"
    else:
        return str(n)


if __name__ == "__main__":
    print(", ".join(fizzbuzz(i) for i in range(1, 21)))

このコードを生成するコードを出力してくれる。

$ python -m prestring.python 01fizzbuzz.py
from prestring.python import PythonModule


def gen(*, m=None, indent='    '):
    m = m or PythonModule(indent=indent)

    with m.def_('fizzbuzz', 'n: int', return_type='str'):
        with m.if_('n % 3 == 0 and n % 5 == 0'):
            m.stmt('return "fizzbuzz"')
        with m.elif_('n % 3 == 0'):
            m.stmt('return "fizz"')
        with m.elif_('n % 5 == 0'):
            m.stmt('return "buzz"')
        with m.else_():
            m.stmt('return str(n)')

    with m.if_('__name__ == "__main__"'):
        m.stmt('print(", ".join(fizzbuzz(i) for i in range(1, 21)))')
    return m


if __name__ == "__main__":
    m = gen(indent='    ')
    print(m)

もちろんこのコードが出力したコードを実行すれば元のコードのように振る舞う。

$ python <(python <(python -m prestring.python 01fizzbuzz.py))
1, 2, fizz, 4, buzz, fizz, 7, 8, fizz, buzz, 11, fizz, 13, 14, fizzbuzz, 16, 17, fizz, 19, buzz

async/await 対応

ここからがようやく本題。そんなprestringだけれど。今まではasync/awaitの構文をサポートしていなかった。 これを今回サポートしたという話。例えば以下の様なコードを書く。オプションとして async_=True を付けるとasync defやasync forなどとして扱われる。

例えば、pythonのドキュメントのfutureの部分のコードは以下の様な形で書ける。

from prestring.python import PythonModule as Module


m = Module()

m.import_("asyncio")
m.stmt("# from: https://docs.python.org/ja/3/library/asyncio-future.html")
m.sep()

with m.def_("set_after", "fut", "delay", "value", async_=True):
    m.stmt("# Sleep for *delay* seconds.")
    m.stmt("await asyncio.sleep(delay)")

    m.stmt("# Set *value* as a result of *fut* Future.")
    m.stmt("fut.set_result(value)")

with m.def_("main", async_=True):
    m.stmt("# Get the current event loop.")
    m.stmt("loop = asyncio.get_running_loop()")

    m.stmt("# Create a new Future object.")
    m.stmt("fut = loop.create_future()")

    m.stmt('# Run "set_after()" coroutine in a parallel Task.')
    m.stmt('# We are using the low-level "loop.create_task()" API here because')
    m.stmt("# we already have a reference to the event loop at hand.")
    m.stmt('# Otherwise we could have just used "asyncio.create_task()".')

    m.stmt('loop.create_task(set_after(fut, 1, "... world"))')
    m.stmt('print("hello ...")')

    m.stmt("# Wait until *fut* has a result (1 second) and print it.")
    m.stmt("print(await fut)")

m.stmt("asyncio.run(main())")
print(m)

実行結果

$ python 02asyncio-future.py
import asyncio
# from: https://docs.python.org/ja/3/library/asyncio-future.html


async def set_after(fut, delay, value):
    # Sleep for *delay* seconds.
    await asyncio.sleep(delay)
    # Set *value* as a result of *fut* Future.
    fut.set_result(value)


async def main():
    # Get the current event loop.
    loop = asyncio.get_running_loop()
    # Create a new Future object.
    fut = loop.create_future()
    # Run "set_after()" coroutine in a parallel Task.
    # We are using the low-level "loop.create_task()" API here because
    # we already have a reference to the event loop at hand.
    # Otherwise we could have just used "asyncio.create_task()".
    loop.create_task(set_after(fut, 1, "... world"))
    print("hello ...")
    # Wait until *fut* has a result (1 second) and print it.
    print(await fut)


asyncio.run(main())

async for, async with

もちろんasync for, async withにも対応している。そして先程の python -m prestring.python も完全に手書きしたものと同じにはならないがasync/awaitが使われているコードも対応している。

例えばこういうトリビアルなコードがあったときに

aexecutor.py

import typing as t
import asyncio
from functools import partial


class AExecutor:
    def __init__(self):
        self.q = asyncio.Queue()

    async def __aenter__(self) -> t.Callable[..., t.Awaitable[None]]:
        async def loop():
            while True:
                afn = await self.q.get()
                if afn is None:
                    self.q.task_done()
                    break
                await afn()
                self.q.task_done()

        asyncio.ensure_future(loop())
        return self.q.put

    async def __aexit__(
        self,
        exc: t.Optional[t.Type[BaseException]],
        value: t.Optional[BaseException],
        tb: t.Any,
    ):
        await self.q.put(None)
        await self.q.join()


async def arange(n: int) -> t.AsyncIterator[int]:
    for i in range(n):
        yield i
        await asyncio.sleep(0.1)


async def run():
    async with AExecutor() as submit:

        async def task(tag: str):
            async for i in arange(3):
                print(tag, i)

        await submit(partial(task, "x"))
        await submit(partial(task, "y"))


def main():
    asyncio.run(run())


if __name__ == "__main__":
    main()

python -m prestring.python は以下の様なコードを生成する。

$ python -m prestring.python aexecutor.py
from prestring.python import PythonModule


def gen(*, m=None, indent='    '):
    m = m or PythonModule(indent=indent)

    m.import_('typing as t')
    m.import_('asyncio')
    m.from_('functools', 'partial')
    with m.class_('AExecutor'):
        with m.def_('__init__', 'self'):
            m.stmt('self.q = asyncio.Queue()')

        with m.def_('__aenter__', 'self', return_type='t.Callable[..., t.Awaitable[None]]', async_=True):
            with m.def_('loop', async_=True):
                with m.while_('True'):
                    m.stmt('afn = await self.q.get()')
                    with m.if_('afn is None'):
                        m.stmt('self.q.task_done()')
                        m.stmt('break')
                    m.stmt('await afn()')
                    m.stmt('self.q.task_done()')

            m.stmt('asyncio.ensure_future(loop())')
            m.stmt('return self.q.put')

        with m.def_('__aexit__', 'self', 'exc: t.Optional[t.Type[BaseException]]', 'value: t.Optional[BaseException]', 'tb: t.Any', async_=True):
            m.stmt('await self.q.put(None)')
            m.stmt('await self.q.join()')


    with m.def_('arange', 'n: int', return_type='t.AsyncIterator[int]', async_=True):
        with m.for_('i in range(n)'):
            m.stmt('yield i')
            m.stmt('await asyncio.sleep(0.1)')

    with m.def_('run', async_=True):
        with m.with_('AExecutor() as submit', async_=True):
            with m.def_('task', 'tag: str', async_=True):
                with m.for_('i in arange(3)', async_=True):
                    m.stmt('print(tag, i)')

            m.stmt('await submit(partial(task, "x"))')
            m.stmt('await submit(partial(task, "y"))')

    with m.def_('main'):
        m.stmt('asyncio.run(run())')

    with m.if_('__name__ == "__main__"'):
        m.stmt('main()')
    return m


if __name__ == "__main__":
    m = gen(indent='    ')
    print(m)

もちろん出力結果は正しいpythonコードなので実行もできる。

$ python <(python <(python -m prestring.python aexecutor.py))
x 0
x 1
x 2
y 0
y 1
y 2

おまけ prestring.python.parse

ついでに python -m prestring.python のコードを書いていてlib2to3用のASTを確認するのがめんどうだったので python -m prestring.python.parse でASTをdumpする機能もつけてみた。

$ python -m prestring.python.parse aexecutor.py
file_input [9 children]
  simple_stmt [2 children]
    import_name [2 children]
      NAME('import') [lineno=1, column=0, prefix='']
      dotted_as_name [3 children]
        NAME('typing') [lineno=1, column=7, prefix=' ']
        NAME('as') [lineno=1, column=14, prefix=' ']
        NAME('t') [lineno=1, column=17, prefix=' ']
    NEWLINE('\n') [lineno=1, column=18, prefix='']
  simple_stmt [2 children]
    import_name [2 children]
      NAME('import') [lineno=2, column=0, prefix='']
      NAME('asyncio') [lineno=2, column=7, prefix=' ']
    NEWLINE('\n') [lineno=2, column=14, prefix='']
  simple_stmt [2 children]
    import_from [4 children]
      NAME('from') [lineno=3, column=0, prefix='']
      NAME('functools') [lineno=3, column=5, prefix=' ']
      NAME('import') [lineno=3, column=15, prefix=' ']
      NAME('partial') [lineno=3, column=22, prefix=' ']
    NEWLINE('\n') [lineno=3, column=29, prefix='']
  classdef[name='AExecutor'] [4 children]
    NAME('class') [lineno=6, column=0, prefix='\n\n']
    NAME('AExecutor') [lineno=6, column=6, prefix=' ']
    COLON(':') [lineno=6, column=15, prefix='']
    suite [6 children]
      NEWLINE('\n') [lineno=6, column=16, prefix='']
      INDENT('    ') [lineno=7, column=0, prefix='']
      funcdef[name='__init__'] [5 children]
        NAME('def') [lineno=7, column=4, prefix='']
        NAME('__init__') [lineno=7, column=8, prefix=' ']
        parameters [3 children]
          LPAR('(') [lineno=7, column=16, prefix='']
          NAME('self') [lineno=7, column=17, prefix='']
          RPAR(')') [lineno=7, column=21, prefix='']
        COLON(':') [lineno=7, column=22, prefix='']
        suite [4 children]
          NEWLINE('\n') [lineno=7, column=23, prefix='']
          INDENT('        ') [lineno=8, column=0, prefix='']
          simple_stmt [2 children]
            expr_stmt [3 children]
              power [2 children]
                NAME('self') [lineno=8, column=8, prefix='']
                trailer [2 children]
                  DOT('.') [lineno=8, column=12, prefix='']
                  NAME('q') [lineno=8, column=13, prefix='']
              EQUAL('=') [lineno=8, column=15, prefix=' ']
              power [3 children]
                NAME('asyncio') [lineno=8, column=17, prefix=' ']
                trailer [2 children]
                  DOT('.') [lineno=8, column=24, prefix='']
                  NAME('Queue') [lineno=8, column=25, prefix='']
                trailer [2 children]
                  LPAR('(') [lineno=8, column=30, prefix='']
                  RPAR(')') [lineno=8, column=31, prefix='']
            NEWLINE('\n') [lineno=8, column=32, prefix='']
          DEDENT('') [lineno=10, column=4, prefix='\n    ']
      async_stmt [2 children]
        ASYNC('async') [lineno=10, column=4, prefix='']
        funcdef[name='__aenter__'] [7 children]
          NAME('def') [lineno=10, column=10, prefix=' ']
          NAME('__aenter__') [lineno=10, column=14, prefix=' ']
          parameters [3 children]
            LPAR('(') [lineno=10, column=24, prefix='']
            NAME('self') [lineno=10, column=25, prefix='']
            RPAR(')') [lineno=10, column=29, prefix='']
          RARROW('->') [lineno=10, column=31, prefix=' ']
          power [3 children]
            NAME('t') [lineno=10, column=34, prefix=' ']
            trailer [2 children]
              DOT('.') [lineno=10, column=35, prefix='']
              NAME('Callable') [lineno=10, column=36, prefix='']
            trailer [3 children]
              LSQB('[') [lineno=10, column=44, prefix='']
              subscriptlist [3 children]
                atom [3 children]
                  DOT('.') [lineno=10, column=45, prefix='']
                  DOT('.') [lineno=10, column=46, prefix='']
                  DOT('.') [lineno=10, column=47, prefix='']
                COMMA(',') [lineno=10, column=48, prefix='']
                power [3 children]
                  NAME('t') [lineno=10, column=50, prefix=' ']
                  trailer [2 children]
                    DOT('.') [lineno=10, column=51, prefix='']
                    NAME('Awaitable') [lineno=10, column=52, prefix='']
                  trailer [3 children]
                    LSQB('[') [lineno=10, column=61, prefix='']
                    NAME('None') [lineno=10, column=62, prefix='']
                    RSQB(']') [lineno=10, column=66, prefix='']
              RSQB(']') [lineno=10, column=67, prefix='']
          COLON(':') [lineno=10, column=68, prefix='']
          suite [6 children]
            NEWLINE('\n') [lineno=10, column=69, prefix='']
            INDENT('        ') [lineno=11, column=0, prefix='']
            async_stmt [2 children]
              ASYNC('async') [lineno=11, column=8, prefix='']
              funcdef[name='loop'] [5 children]
                NAME('def') [lineno=11, column=14, prefix=' ']
                NAME('loop') [lineno=11, column=18, prefix=' ']
                parameters [2 children]
                  LPAR('(') [lineno=11, column=22, prefix='']
                  RPAR(')') [lineno=11, column=23, prefix='']
                COLON(':') [lineno=11, column=24, prefix='']
                suite [4 children]
                  NEWLINE('\n') [lineno=11, column=25, prefix='']
                  INDENT('            ') [lineno=12, column=0, prefix='']
                  while_stmt [4 children]
                    NAME('while') [lineno=12, column=12, prefix='']
                    NAME('True') [lineno=12, column=18, prefix=' ']
                    COLON(':') [lineno=12, column=22, prefix='']
                    suite [7 children]
                      NEWLINE('\n') [lineno=12, column=23, prefix='']
                      INDENT('                ') [lineno=13, column=0, prefix='']
                      simple_stmt [2 children]
                        expr_stmt [3 children]
                          NAME('afn') [lineno=13, column=16, prefix='']
                          EQUAL('=') [lineno=13, column=20, prefix=' ']
                          power [5 children]
                            AWAIT('await') [lineno=13, column=22, prefix=' ']
                            NAME('self') [lineno=13, column=28, prefix=' ']
                            trailer [2 children]
                              DOT('.') [lineno=13, column=32, prefix='']
                              NAME('q') [lineno=13, column=33, prefix='']
                            trailer [2 children]
                              DOT('.') [lineno=13, column=34, prefix='']
                              NAME('get') [lineno=13, column=35, prefix='']
                            trailer [2 children]
                              LPAR('(') [lineno=13, column=38, prefix='']
                              RPAR(')') [lineno=13, column=39, prefix='']
                        NEWLINE('\n') [lineno=13, column=40, prefix='']
                      if_stmt [4 children]
                        NAME('if') [lineno=14, column=16, prefix='                ']
                        comparison [3 children]
                          NAME('afn') [lineno=14, column=19, prefix=' ']
                          NAME('is') [lineno=14, column=23, prefix=' ']
                          NAME('None') [lineno=14, column=26, prefix=' ']
                        COLON(':') [lineno=14, column=30, prefix='']
                        suite [5 children]
                          NEWLINE('\n') [lineno=14, column=31, prefix='']
                          INDENT('                    ') [lineno=15, column=0, prefix='']
                          simple_stmt [2 children]
                            power [4 children]
                              NAME('self') [lineno=15, column=20, prefix='']
                              trailer [2 children]
                                DOT('.') [lineno=15, column=24, prefix='']
                                NAME('q') [lineno=15, column=25, prefix='']
                              trailer [2 children]
                                DOT('.') [lineno=15, column=26, prefix='']
                                NAME('task_done') [lineno=15, column=27, prefix='']
                              trailer [2 children]
                                LPAR('(') [lineno=15, column=36, prefix='']
                                RPAR(')') [lineno=15, column=37, prefix='']
                            NEWLINE('\n') [lineno=15, column=38, prefix='']
                          simple_stmt [2 children]
                            NAME('break') [lineno=16, column=20, prefix='                    ']
                            NEWLINE('\n') [lineno=16, column=25, prefix='']
                          DEDENT('') [lineno=17, column=16, prefix='                ']
                      simple_stmt [2 children]
                        power [3 children]
                          AWAIT('await') [lineno=17, column=16, prefix='']
                          NAME('afn') [lineno=17, column=22, prefix=' ']
                          trailer [2 children]
                            LPAR('(') [lineno=17, column=25, prefix='']
                            RPAR(')') [lineno=17, column=26, prefix='']
                        NEWLINE('\n') [lineno=17, column=27, prefix='']
                      simple_stmt [2 children]
                        power [4 children]
                          NAME('self') [lineno=18, column=16, prefix='                ']
                          trailer [2 children]
                            DOT('.') [lineno=18, column=20, prefix='']
                            NAME('q') [lineno=18, column=21, prefix='']
                          trailer [2 children]
                            DOT('.') [lineno=18, column=22, prefix='']
                            NAME('task_done') [lineno=18, column=23, prefix='']
                          trailer [2 children]
                            LPAR('(') [lineno=18, column=32, prefix='']
                            RPAR(')') [lineno=18, column=33, prefix='']
                        NEWLINE('\n') [lineno=18, column=34, prefix='']
                      DEDENT('') [lineno=20, column=8, prefix='\n        ']
                  DEDENT('') [lineno=20, column=8, prefix='']
            simple_stmt [2 children]
              power [3 children]
                NAME('asyncio') [lineno=20, column=8, prefix='']
                trailer [2 children]
                  DOT('.') [lineno=20, column=15, prefix='']
                  NAME('ensure_future') [lineno=20, column=16, prefix='']
                trailer [3 children]
                  LPAR('(') [lineno=20, column=29, prefix='']
                  power [2 children]
                    NAME('loop') [lineno=20, column=30, prefix='']
                    trailer [2 children]
                      LPAR('(') [lineno=20, column=34, prefix='']
                      RPAR(')') [lineno=20, column=35, prefix='']
                  RPAR(')') [lineno=20, column=36, prefix='']
              NEWLINE('\n') [lineno=20, column=37, prefix='']
            simple_stmt [2 children]
              return_stmt [2 children]
                NAME('return') [lineno=21, column=8, prefix='        ']
                power [3 children]
                  NAME('self') [lineno=21, column=15, prefix=' ']
                  trailer [2 children]
                    DOT('.') [lineno=21, column=19, prefix='']
                    NAME('q') [lineno=21, column=20, prefix='']
                  trailer [2 children]
                    DOT('.') [lineno=21, column=21, prefix='']
                    NAME('put') [lineno=21, column=22, prefix='']
              NEWLINE('\n') [lineno=21, column=25, prefix='']
            DEDENT('') [lineno=23, column=4, prefix='\n    ']
      async_stmt [2 children]
        ASYNC('async') [lineno=23, column=4, prefix='']
        funcdef[name='__aexit__'] [5 children]
          NAME('def') [lineno=23, column=10, prefix=' ']
          NAME('__aexit__') [lineno=23, column=14, prefix=' ']
          parameters [3 children]
            LPAR('(') [lineno=23, column=23, prefix='']
            typedargslist[args='self' ',' 'tname' ',' 'tname' ',' 'tname' ','] [8 children]
              NAME('self') [lineno=24, column=8, prefix='\n        ']
              COMMA(',') [lineno=24, column=12, prefix='']
              tname [3 children]
                NAME('exc') [lineno=25, column=8, prefix='\n        ']
                COLON(':') [lineno=25, column=11, prefix='']
                power [3 children]
                  NAME('t') [lineno=25, column=13, prefix=' ']
                  trailer [2 children]
                    DOT('.') [lineno=25, column=14, prefix='']
                    NAME('Optional') [lineno=25, column=15, prefix='']
                  trailer [3 children]
                    LSQB('[') [lineno=25, column=23, prefix='']
                    power [3 children]
                      NAME('t') [lineno=25, column=24, prefix='']
                      trailer [2 children]
                        DOT('.') [lineno=25, column=25, prefix='']
                        NAME('Type') [lineno=25, column=26, prefix='']
                      trailer [3 children]
                        LSQB('[') [lineno=25, column=30, prefix='']
                        NAME('BaseException') [lineno=25, column=31, prefix='']
                        RSQB(']') [lineno=25, column=44, prefix='']
                    RSQB(']') [lineno=25, column=45, prefix='']
              COMMA(',') [lineno=25, column=46, prefix='']
              tname [3 children]
                NAME('value') [lineno=26, column=8, prefix='\n        ']
                COLON(':') [lineno=26, column=13, prefix='']
                power [3 children]
                  NAME('t') [lineno=26, column=15, prefix=' ']
                  trailer [2 children]
                    DOT('.') [lineno=26, column=16, prefix='']
                    NAME('Optional') [lineno=26, column=17, prefix='']
                  trailer [3 children]
                    LSQB('[') [lineno=26, column=25, prefix='']
                    NAME('BaseException') [lineno=26, column=26, prefix='']
                    RSQB(']') [lineno=26, column=39, prefix='']
              COMMA(',') [lineno=26, column=40, prefix='']
              tname [3 children]
                NAME('tb') [lineno=27, column=8, prefix='\n        ']
                COLON(':') [lineno=27, column=10, prefix='']
                power [2 children]
                  NAME('t') [lineno=27, column=12, prefix=' ']
                  trailer [2 children]
                    DOT('.') [lineno=27, column=13, prefix='']
                    NAME('Any') [lineno=27, column=14, prefix='']
              COMMA(',') [lineno=27, column=17, prefix='']
            RPAR(')') [lineno=28, column=4, prefix='\n    ']
          COLON(':') [lineno=28, column=5, prefix='']
          suite [5 children]
            NEWLINE('\n') [lineno=28, column=6, prefix='']
            INDENT('        ') [lineno=29, column=0, prefix='']
            simple_stmt [2 children]
              power [5 children]
                AWAIT('await') [lineno=29, column=8, prefix='']
                NAME('self') [lineno=29, column=14, prefix=' ']
                trailer [2 children]
                  DOT('.') [lineno=29, column=18, prefix='']
                  NAME('q') [lineno=29, column=19, prefix='']
                trailer [2 children]
                  DOT('.') [lineno=29, column=20, prefix='']
                  NAME('put') [lineno=29, column=21, prefix='']
                trailer [3 children]
                  LPAR('(') [lineno=29, column=24, prefix='']
                  NAME('None') [lineno=29, column=25, prefix='']
                  RPAR(')') [lineno=29, column=29, prefix='']
              NEWLINE('\n') [lineno=29, column=30, prefix='']
            simple_stmt [2 children]
              power [5 children]
                AWAIT('await') [lineno=30, column=8, prefix='        ']
                NAME('self') [lineno=30, column=14, prefix=' ']
                trailer [2 children]
                  DOT('.') [lineno=30, column=18, prefix='']
                  NAME('q') [lineno=30, column=19, prefix='']
                trailer [2 children]
                  DOT('.') [lineno=30, column=20, prefix='']
                  NAME('join') [lineno=30, column=21, prefix='']
                trailer [2 children]
                  LPAR('(') [lineno=30, column=25, prefix='']
                  RPAR(')') [lineno=30, column=26, prefix='']
              NEWLINE('\n') [lineno=30, column=27, prefix='']
            DEDENT('') [lineno=33, column=0, prefix='\n\n']
      DEDENT('') [lineno=33, column=0, prefix='']
  async_stmt [2 children]
    ASYNC('async') [lineno=33, column=0, prefix='']
    funcdef[name='arange'] [7 children]
      NAME('def') [lineno=33, column=6, prefix=' ']
      NAME('arange') [lineno=33, column=10, prefix=' ']
      parameters [3 children]
        LPAR('(') [lineno=33, column=16, prefix='']
        tname [3 children]
          NAME('n') [lineno=33, column=17, prefix='']
          COLON(':') [lineno=33, column=18, prefix='']
          NAME('int') [lineno=33, column=20, prefix=' ']
        RPAR(')') [lineno=33, column=23, prefix='']
      RARROW('->') [lineno=33, column=25, prefix=' ']
      power [3 children]
        NAME('t') [lineno=33, column=28, prefix=' ']
        trailer [2 children]
          DOT('.') [lineno=33, column=29, prefix='']
          NAME('AsyncIterator') [lineno=33, column=30, prefix='']
        trailer [3 children]
          LSQB('[') [lineno=33, column=43, prefix='']
          NAME('int') [lineno=33, column=44, prefix='']
          RSQB(']') [lineno=33, column=47, prefix='']
      COLON(':') [lineno=33, column=48, prefix='']
      suite [4 children]
        NEWLINE('\n') [lineno=33, column=49, prefix='']
        INDENT('    ') [lineno=34, column=0, prefix='']
        for_stmt [6 children]
          NAME('for') [lineno=34, column=4, prefix='']
          NAME('i') [lineno=34, column=8, prefix=' ']
          NAME('in') [lineno=34, column=10, prefix=' ']
          power [2 children]
            NAME('range') [lineno=34, column=13, prefix=' ']
            trailer [3 children]
              LPAR('(') [lineno=34, column=18, prefix='']
              NAME('n') [lineno=34, column=19, prefix='']
              RPAR(')') [lineno=34, column=20, prefix='']
          COLON(':') [lineno=34, column=21, prefix='']
          suite [5 children]
            NEWLINE('\n') [lineno=34, column=22, prefix='']
            INDENT('        ') [lineno=35, column=0, prefix='']
            simple_stmt [2 children]
              yield_expr [2 children]
                NAME('yield') [lineno=35, column=8, prefix='']
                NAME('i') [lineno=35, column=14, prefix=' ']
              NEWLINE('\n') [lineno=35, column=15, prefix='']
            simple_stmt [2 children]
              power [4 children]
                AWAIT('await') [lineno=36, column=8, prefix='        ']
                NAME('asyncio') [lineno=36, column=14, prefix=' ']
                trailer [2 children]
                  DOT('.') [lineno=36, column=21, prefix='']
                  NAME('sleep') [lineno=36, column=22, prefix='']
                trailer [3 children]
                  LPAR('(') [lineno=36, column=27, prefix='']
                  NUMBER('0.1') [lineno=36, column=28, prefix='']
                  RPAR(')') [lineno=36, column=31, prefix='']
              NEWLINE('\n') [lineno=36, column=32, prefix='']
            DEDENT('') [lineno=39, column=0, prefix='\n\n']
        DEDENT('') [lineno=39, column=0, prefix='']
  async_stmt [2 children]
    ASYNC('async') [lineno=39, column=0, prefix='']
    funcdef[name='run'] [5 children]
      NAME('def') [lineno=39, column=6, prefix=' ']
      NAME('run') [lineno=39, column=10, prefix=' ']
      parameters [2 children]
        LPAR('(') [lineno=39, column=13, prefix='']
        RPAR(')') [lineno=39, column=14, prefix='']
      COLON(':') [lineno=39, column=15, prefix='']
      suite [4 children]
        NEWLINE('\n') [lineno=39, column=16, prefix='']
        INDENT('    ') [lineno=40, column=0, prefix='']
        async_stmt [2 children]
          ASYNC('async') [lineno=40, column=4, prefix='']
          with_stmt [4 children]
            NAME('with') [lineno=40, column=10, prefix=' ']
            with_item [3 children]
              power [2 children]
                NAME('AExecutor') [lineno=40, column=15, prefix=' ']
                trailer [2 children]
                  LPAR('(') [lineno=40, column=24, prefix='']
                  RPAR(')') [lineno=40, column=25, prefix='']
              NAME('as') [lineno=40, column=27, prefix=' ']
              NAME('submit') [lineno=40, column=30, prefix=' ']
            COLON(':') [lineno=40, column=36, prefix='']
            suite [6 children]
              NEWLINE('\n') [lineno=40, column=37, prefix='']
              INDENT('        ') [lineno=42, column=0, prefix='\n']
              async_stmt [2 children]
                ASYNC('async') [lineno=42, column=8, prefix='']
                funcdef[name='task'] [5 children]
                  NAME('def') [lineno=42, column=14, prefix=' ']
                  NAME('task') [lineno=42, column=18, prefix=' ']
                  parameters [3 children]
                    LPAR('(') [lineno=42, column=22, prefix='']
                    tname [3 children]
                      NAME('tag') [lineno=42, column=23, prefix='']
                      COLON(':') [lineno=42, column=26, prefix='']
                      NAME('str') [lineno=42, column=28, prefix=' ']
                    RPAR(')') [lineno=42, column=31, prefix='']
                  COLON(':') [lineno=42, column=32, prefix='']
                  suite [4 children]
                    NEWLINE('\n') [lineno=42, column=33, prefix='']
                    INDENT('            ') [lineno=43, column=0, prefix='']
                    async_stmt [2 children]
                      ASYNC('async') [lineno=43, column=12, prefix='']
                      for_stmt [6 children]
                        NAME('for') [lineno=43, column=18, prefix=' ']
                        NAME('i') [lineno=43, column=22, prefix=' ']
                        NAME('in') [lineno=43, column=24, prefix=' ']
                        power [2 children]
                          NAME('arange') [lineno=43, column=27, prefix=' ']
                          trailer [3 children]
                            LPAR('(') [lineno=43, column=33, prefix='']
                            NUMBER('3') [lineno=43, column=34, prefix='']
                            RPAR(')') [lineno=43, column=35, prefix='']
                        COLON(':') [lineno=43, column=36, prefix='']
                        suite [4 children]
                          NEWLINE('\n') [lineno=43, column=37, prefix='']
                          INDENT('                ') [lineno=44, column=0, prefix='']
                          simple_stmt [2 children]
                            power [2 children]
                              NAME('print') [lineno=44, column=16, prefix='']
                              trailer [3 children]
                                LPAR('(') [lineno=44, column=21, prefix='']
                                arglist [3 children]
                                  NAME('tag') [lineno=44, column=22, prefix='']
                                  COMMA(',') [lineno=44, column=25, prefix='']
                                  NAME('i') [lineno=44, column=27, prefix=' ']
                                RPAR(')') [lineno=44, column=28, prefix='']
                            NEWLINE('\n') [lineno=44, column=29, prefix='']
                          DEDENT('') [lineno=46, column=8, prefix='\n        ']
                    DEDENT('') [lineno=46, column=8, prefix='']
              simple_stmt [2 children]
                power [3 children]
                  AWAIT('await') [lineno=46, column=8, prefix='']
                  NAME('submit') [lineno=46, column=14, prefix=' ']
                  trailer [3 children]
                    LPAR('(') [lineno=46, column=20, prefix='']
                    power [2 children]
                      NAME('partial') [lineno=46, column=21, prefix='']
                      trailer [3 children]
                        LPAR('(') [lineno=46, column=28, prefix='']
                        arglist [3 children]
                          NAME('task') [lineno=46, column=29, prefix='']
                          COMMA(',') [lineno=46, column=33, prefix='']
                          STRING('"x"') [lineno=46, column=35, prefix=' ']
                        RPAR(')') [lineno=46, column=38, prefix='']
                    RPAR(')') [lineno=46, column=39, prefix='']
                NEWLINE('\n') [lineno=46, column=40, prefix='']
              simple_stmt [2 children]
                power [3 children]
                  AWAIT('await') [lineno=47, column=8, prefix='        ']
                  NAME('submit') [lineno=47, column=14, prefix=' ']
                  trailer [3 children]
                    LPAR('(') [lineno=47, column=20, prefix='']
                    power [2 children]
                      NAME('partial') [lineno=47, column=21, prefix='']
                      trailer [3 children]
                        LPAR('(') [lineno=47, column=28, prefix='']
                        arglist [3 children]
                          NAME('task') [lineno=47, column=29, prefix='']
                          COMMA(',') [lineno=47, column=33, prefix='']
                          STRING('"y"') [lineno=47, column=35, prefix=' ']
                        RPAR(')') [lineno=47, column=38, prefix='']
                    RPAR(')') [lineno=47, column=39, prefix='']
                NEWLINE('\n') [lineno=47, column=40, prefix='']
              DEDENT('') [lineno=50, column=0, prefix='\n\n']
        DEDENT('') [lineno=50, column=0, prefix='']
  funcdef[name='main'] [5 children]
    NAME('def') [lineno=50, column=0, prefix='']
    NAME('main') [lineno=50, column=4, prefix=' ']
    parameters [2 children]
      LPAR('(') [lineno=50, column=8, prefix='']
      RPAR(')') [lineno=50, column=9, prefix='']
    COLON(':') [lineno=50, column=10, prefix='']
    suite [4 children]
      NEWLINE('\n') [lineno=50, column=11, prefix='']
      INDENT('    ') [lineno=51, column=0, prefix='']
      simple_stmt [2 children]
        power [3 children]
          NAME('asyncio') [lineno=51, column=4, prefix='']
          trailer [2 children]
            DOT('.') [lineno=51, column=11, prefix='']
            NAME('run') [lineno=51, column=12, prefix='']
          trailer [3 children]
            LPAR('(') [lineno=51, column=15, prefix='']
            power [2 children]
              NAME('run') [lineno=51, column=16, prefix='']
              trailer [2 children]
                LPAR('(') [lineno=51, column=19, prefix='']
                RPAR(')') [lineno=51, column=20, prefix='']
            RPAR(')') [lineno=51, column=21, prefix='']
        NEWLINE('\n') [lineno=51, column=22, prefix='']
      DEDENT('') [lineno=54, column=0, prefix='\n\n']
  if_stmt [4 children]
    NAME('if') [lineno=54, column=0, prefix='']
    comparison [3 children]
      NAME('__name__') [lineno=54, column=3, prefix=' ']
      EQEQUAL('==') [lineno=54, column=12, prefix=' ']
      STRING('"__main__"') [lineno=54, column=15, prefix=' ']
    COLON(':') [lineno=54, column=25, prefix='']
    suite [4 children]
      NEWLINE('\n') [lineno=54, column=26, prefix='']
      INDENT('    ') [lineno=55, column=0, prefix='']
      simple_stmt [2 children]
        power [2 children]
          NAME('main') [lineno=55, column=4, prefix='']
          trailer [2 children]
            LPAR('(') [lineno=55, column=8, prefix='']
            RPAR(')') [lineno=55, column=9, prefix='']
        NEWLINE('\n') [lineno=55, column=10, prefix='']
      DEDENT('') [lineno=56, column=0, prefix='']
  ENDMARKER('') [lineno=56, column=0, prefix='']

おしまい。

gist

gistは以下



以上の内容はhttps://pod.hatenablog.com/entry/2020/02/22/223610より取得しました。
このページはhttp://font.textar.tv/のウェブフォントを使用してます
不具合報告/要望等はこちらへお願いします。
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