none value in python code example

Example: None python

# The None keyword is effectively the same as null
# Functions without a return will return None

>>> def has_no_return():
...     pass
>>> has_no_return()
>>> print(has_no_return())
None

# Often, you’ll use None as part of a comparison.
# One example is when you need to check and see if some result or parameter is None.

>>> import re
>>> match = re.match(r"Goodbye", "Hello, World!")
>>> if match is None:
...     print("It doesn't match.")
"It doesn't match."