Yo hold up.

wait_callable_true.py

from typing import Any, Callable, Optional

class wait_callable_true(object):
    """Wait until a callable evaluates to a truthy statement, then continue.
    
    This object can be used as a function or as a context manager.

    Args:
        callable: A function which should eventually return a truthy value.
        call_rate: The rate at which to test the callable, optional.

    Examples:
        >>> iterable = [False, True, True, False, False]
        >>> with wait_callable_true(iterable.pop):
        ...     print(iterable)
        [False, True]
        
        >>> # Trivial example of waiting a quarter of a second
        >>> wait_callable_true(lambda: time.sleep(0.25) or 1)
        >>> print(repr('done!'))
        'done!'        

    """

    def __init__(self, statement: Callable, call_rate: Optional[int] = None) -> None:
        self.statement = statement
        self.call_rate = call_rate
        while not self.statement():
            if self.call_rate is not None:
                time.sleep(self.call_rate)

    def __enter__(self) -> None:
        """Do nothing on enter."""
        pass

    def __exit__(self, type_: Any, value: Any, traceback: Any) -> None:
        """Do nothing on exit."""
        pass