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Correctness

Common mistakes

default-mutable-dict

Function FmutatesdefaultdictF mutates default dict FmutatesdefaultdictD. Python only instantiates default function arguments once and shares the instance across the function calls. If the default function argument is mutated, that will modify the instance used by all future function calls. This can cause unexpected results, or lead to security vulnerabilities whereby one function consumer can view or modify the data of another function consumer. Instead, use a default argument (like None) to indicate that no argument was provided and instantiate a new dictionary at that time. For example: if $D is None: $D = {}.

is-not-is-not

In Python ‘X is not …’ is different from ‘X is (not …)’. In the latter the ‘not’ converts the ’…’ directly to boolean.

string-concat-in-list

Detected strings that are implicitly concatenated inside a list. Python will implicitly concatenate strings when not explicitly delimited. Was this supposed to be individual elements of the list?

default-mutable-list

Function FmutatesdefaultlistF mutates default list FmutatesdefaultlistD. Python only instantiates default function arguments once and shares the instance across the function calls. If the default function argument is mutated, that will modify the instance used by all future function calls. This can cause unexpected results, or lead to security vulnerabilities whereby one function consumer can view or modify the data of another function consumer. Instead, use a default argument (like None) to indicate that no argument was provided and instantiate a new list at that time. For example: if $D is None: $D = [].

identical-is-comparison

Found identical comparison using is. Ensure this is what you intended.

string-is-comparison

Found string comparison using ‘is’ operator. The ‘is’ operator is for reference equality, not value equality, and therefore should not be used to compare strings. For more information, see https://github.com/satwikkansal/wtfpython#-how-not-to-use-is-operator”
CorrectnessExceptions
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