input - PYTHON get files from command line

Question

How do you get a file name from command line when you run a Python code? Like if your code opens a file and reads the line, but the file varies whenever you run it, how to you say:

python code.py input.txt

so the code analyzes "input.txt"? What would you have to do in the actual Python code? I know, this is a pretty vague question, but I don't really know how to explain it any better.

Answer 1

A great option is the fileinput module, which will grab any or all filenames from the command line, and give the specified files' contents to your script as though they were one big file.

import fileinput
for line in fileinput.input():
    process(line)

More information here.