Shadowing built-in names

Reports shadowing built-in names, such as len or list.

Example:

def len(a, b, c):
    d = a + b + c
    return d

In this code fragment, the len built-in name is used. The IDE offers to apply the Rename refactoring as a fix.

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

PyShadowingBuiltins

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Python

Inspection ID: PyShadowingBuiltinsInspection

Inspection options

Here you can find the description of settings available for the Shadowing built-in names inspection, and the reference of their default values.

Ignored built-ins

Option ID:

ignoredNames

Default value:

None

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection PyShadowingBuiltins

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Inspection Details
By default bundled with:	CLion 2025.2, DataSpell 2025.2, IntelliJ IDEA 2025.2, PyCharm 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025