Inspired Python
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def current_datetime(dt = datetime.datetime.now()):
print(dt)
>>> current_datetime()
2021-10-09 16:09:43.009959
>>> current_datetime()
2021-10-09 16:09:43.009959#2
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Python Anti-Patterns: Argument Side Effects
Be extra careful if you assign the result of a function call to a default argument. Python evaluates argument defaults on module load, so if your function is non-deterministic or has side-effects, you could run into trouble. As the example shows, the printed time is frozen; it was set once when the code was first evaluated.