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Current path: opt/alt/python39/lib64/python3.9/asyncio/

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✏️ Editing: base_futures.py

__all__ = ()

import reprlib
from _thread import get_ident

from . import format_helpers

# States for Future.
_PENDING = 'PENDING'
_CANCELLED = 'CANCELLED'
_FINISHED = 'FINISHED'

def isfuture(obj):
    """Check for a Future.

This returns True when obj is a Future instance or is advertising
    itself as duck-type compatible by setting _asyncio_future_blocking.
    See comment in Future for more details.
    """
    return (hasattr(obj.__class__, '_asyncio_future_blocking') and
            obj._asyncio_future_blocking is not None)

def _format_callbacks(cb):
    """helper function for Future.__repr__"""
    size = len(cb)
    if not size:
        cb = ''

def format_cb(callback):
        return format_helpers._format_callback_source(callback, ())

if size == 1:
        cb = format_cb(cb[0][0])
    elif size == 2:
        cb = '{}, {}'.format(format_cb(cb[0][0]), format_cb(cb[1][0]))
    elif size > 2:
        cb = '{}, <{} more>, {}'.format(format_cb(cb[0][0]),
                                        size - 2,
                                        format_cb(cb[-1][0]))
    return f'cb=[{cb}]'

# bpo-42183: _repr_running is needed for repr protection
# when a Future or Task result contains itself directly or indirectly.
# The logic is borrowed from @reprlib.recursive_repr decorator.
# Unfortunately, the direct decorator usage is impossible because of
# AttributeError: '_asyncio.Task' object has no attribute '__module__' error.
#
# After fixing this thing we can return to the decorator based approach.
_repr_running = set()

def _future_repr_info(future):
    # (Future) -> str
    """helper function for Future.__repr__"""
    info = [future._state.lower()]
    if future._state == _FINISHED:
        if future._exception is not None:
            info.append(f'exception={future._exception!r}')
        else:
            key = id(future), get_ident()
            if key in _repr_running:
                result = '...'
            else:
                _repr_running.add(key)
                try:
                    # use reprlib to limit the length of the output, especially
                    # for very long strings
                    result = reprlib.repr(future._result)
                finally:
                    _repr_running.discard(key)
            info.append(f'result={result}')
    if future._callbacks:
        info.append(_format_callbacks(future._callbacks))
    if future._source_traceback:
        frame = future._source_traceback[-1]
        info.append(f'created at {frame[0]}:{frame[1]}')
    return info

📁 __pycache__ | ✏️ Rename | 🗑️ Delete
📄 base_events.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 base_futures.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 base_subprocess.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 base_tasks.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 constants.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 coroutines.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 events.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 exceptions.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 format_helpers.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 futures.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 locks.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 log.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 proactor_events.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 protocols.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 queues.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 runners.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 selector_events.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 sslproto.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 staggered.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 streams.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 subprocess.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 tasks.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 threads.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 transports.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 trsock.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 unix_events.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 windows_events.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 windows_utils.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 __init__.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete
📄 __main__.py | ✏️ Edit | ✏️ Rename | 🗑️ Delete

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