It's somewhat apparent just reading through the python that you are self-taught. Some of the idioms used, especially around file handling, are outdated.

For example: you should open files using the with context handler, or at the very least wrap the file open in a try/except block and put file close in the finally block. Garbage collectors will clean up if you don't properly close, but it's better to be explicit.

I would argue that even if the resume passed through to a hiring manager, they would be reticent to hire based off a single code sample in a language listed as a technical skill where there are red flags like this.

Edit: please note that my comments are for Python only, as I'm not proficient in any of the C family languages. Also, as a Biology major who finally broke into dev myself, I'm completely rooting for you!