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There could be several reasons why a Python file won't open when attempting to run the code, such as:

1. Incorrect filename or file path: Make sure that you have specified the correct filename and file path in the command prompt or terminal.

2. Incorrect Python version: Ensure that you are using the correct version of Python for the file you are attempting to run. If the file is written in Python 3.x, then Python 2.x will not be able to run it.

3. Syntax error: Check that there are no syntax errors in the code. Even a small error, such as a missing parenthesis or colon, can cause the file to fail to run.

4. Missing modules: If the file depends on external modules, such as Selenium or BeautifulSoup, you'll need to make sure that these are installed on your system.

5. File permission issues: If you do not have permission to read or execute the file, it will not open or run. Ensure that the file has the appropriate permission set.

6. Operating system issues: Some operating systems may not be compatible with certain Python code or modules. Make sure that your dependencies are supported on your operating system.

7. Hardware issues: If your computer or device does not have enough RAM or processing power, it may not be able to run the code.