A 'ModuleNotFoundError' occurs when Python cannot find the specified module. Ensure the module is installed in your environment and check your import statements for correctness.

The 'ModuleNotFoundError' is a common exception that occurs when Python is unable to find a specified module during an import statement. This can happen for several reasons, such as the module not being installed in the current environment, a misspelled module name, or issues with the PYTHONPATH environment variable. To resolve this error, begin by confirming that the module you are attempting to import is installed. You can check the installed packages using pip list or pip show module_name commands. If the module is not installed, use pip install module_name to add it to your environment. Next, review your import statement for typos or incorrect casing, as Python is case-sensitive. If you're working in a virtual environment, ensure that it is activated, as this can affect module visibility. Additionally, check the PYTHONPATH to ensure that the directory containing your module is included. By systematically addressing these factors, you can effectively troubleshoot and resolve ModuleNotFoundErrors in your Python projects.