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‘Not…is’ syntax can be unreadable

[/vc_column_text][vc_column_text pl=”0″ pr=”0″ pt=”0″ pb=”0″]Count one violation each time the not … is syntax is encountered.

bad

some_list = None
if not some_list is None:
do_something()

good

some_list = None
if some_list is not None:
do_something()

Note: there is no violation if the operators “and”, “or”, && or ||
are between “not” and “is” because that means that “not” and “is ”
are in different elementary conditions:

if not toto and titi is tata:
do_anything()[/vc_column_text][vc_empty_space height=”12px”][vc_empty_space height=”32px”][vc_single_image image=”5362″ img_link_large=”” img_link_target=”_self” img_size=”full” alignment=”none”][vc_row_inner][vc_column_inner width=”1/2″][vc_column_text pl=”0″ pr=”0″ pt=”0″ pb=”0″]

Why you should care

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In Python readability counts. That is why if-checks should be written with the reader in mind. Therefore it is generally better to write a condition just like one would write prose.

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Business Impacts

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CAST recommendations

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References

https://www.quantifiedcode.com/knowledge-base/readability/%60not%20…%20is%60%20used%20instead%20of%20%60is%20not%60/4ORGpHyx[/vc_column_text][/vc_column_inner][/vc_row_inner][vc_row_inner][vc_column_inner width=”1/1″][vc_single_image image=”5362″ img_link_large=”” img_link_target=”_self” img_size=”full” alignment=”none”][vc_column_text pl=”0″ pr=”0″ pt=”0″ pb=”0″]

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c

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