Function pass_none

Lib/importlib/metadata/_functools.py:91–106

Wrap func so it's not called if its first param is None >>> print_text = pass_none(print) >>> print_text('text') text >>> print_text(None)

(func)

# From jaraco.functools 3.3
def pass_none(func):
    """
    Wrap func so it's not called if its first param is None

    >>> print_text = pass_none(print)
    >>> print_text('text')
    text
    >>> print_text(None)
    """

    @functools.wraps(func)
    def wrapper(param, *args, **kwargs):
        if param is not None:
            return func(param, *args, **kwargs)

    return wrapper


# From jaraco.functools 4.4