Rename Dialog for a Parameter
Use this dialog to rename a parameter.
In addition to renaming the parameter itself, PyCharm can also look for the usages of the parameter name. If found, the changes you are making to the parameter name can also be applied to these usages.
The usages are assigned to different categories which correspond to the options which you can turn on and off.
Note that regardless of the options selected, the search scope (places where you search for the name occurrences) is always limited to the current entity (for example, a file, or a class) and the entities that the current one depends on.
Rename <parameter> and its usages to
Specify a new name for the parameter.
Search in comments and strings
If this checkbox is selected, PyCharm will look for occurrences of the parameter name within comments and string literals in your source code files.
Use this option to set a scope for the Rename refactoring. For example, you can limit the refactoring to only recently changed files, or to only open files, and so on. You can also create a custom scope that you can either share or keep local.