How to solve undefined name error in PyCharm?

There are several possible solutions when PyCharm prompts an undefined name.

1. Import the module: Verify that the required modules have been correctly imported. Modules can be imported by adding import statements at the beginning of the code file.
2. Check for spelling errors: Verify if there are any spelling errors. Make sure that the names used in the code match the names defined exactly.
3. Check scope: Verify that variables or functions are defined before they are referenced. Failure to define a variable or function before referencing it may result in errors related to undefined names.
4. Check the order of the code: make sure that functions or variables defined in the code are called or referenced before. This issue can be resolved by moving the definition of functions or variables to a position before they are called or referenced.
5. Restart the interpreter: Sometimes, the interpreter may encounter errors or exceptions, resulting in certain names being undefined. In this situation, you can try restarting the interpreter and running the program.
6. Check the running environment: If using a virtual environment or conda environment, make sure to run the code in the correct environment.