First argument of the method is reassigned

Reports cases when the first parameter, such as self or cls, is reassigned in a method. Because in most cases, there are no objectives in such reassignment, the IDE indicates an error.

Example:

class Account:
    def calc(self, balance):
        if balance == 0:
            self = balance
        return self

As a fix, you might want to check and modify the algorithm to ensure that reassignment is needed. If everything is correct, you can invoke intention actions for this code and opt to ignore the warning.

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.

PyMethodFirstArgAssignment

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: PyMethodFirstArgAssignmentInspection

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 PyMethodFirstArgAssignment

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