Florian Lindner wrote:
> Hello,
> I want show a deprecation warning only if a argument of a function is set to 
> False.
> def foo(arg1, arg2, arg3 = False):
>     if not arg3:
>         arg3 = deprecation.deprecated(arg3, "arg3=False is deprecated.")
> But that does not show anything. How do it correctly?

Just emit a warning::

import warnings
def foo(arg1, arg2, arg3=False):
    if not arg3:
        warnings.warn("arg3=False is deprecated", DeprecationWarning, 2)

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