Shadowing a builtin makes your code more difficult to read and maintain. It may also be a source of bugs as you can reference the builtin by mistake.


It is sometimes ok to shadow a builtin to improve the readability of a public API or to support multiple versions of a library. In these cases the value is higher than the maintainability cost. Just be careful when you do it.


It is not ok to shadow builtins with variables which are local to a function or method. These variables are not public and can be easily renamed, thus reducing the confusion and making the code less error-prone.


This rule raises an issue when the name of a local variable matches the name of a builtin.


== Noncompliant Code Example

----
def a_function():
    int = 42  # Noncompliant; int is a builtin
----


== Compliant Solution

----
def a_function():
    value = 42
----


== See

* https://docs.python.org/3.8/library/stdtypes.html[Python documentation - Built-in Types]
* https://docs.python.org/3/library/functions.html[Python documentation - Built-in Functions]


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