How to copy file to file using Python?

Question

Python

I'm working on a Python reworking of the old trick of hiding a file within a file.
In cmd it looks like this: "copy 1.jpg + 2.rar 3.jpg"
However, it can't be implemented in python.
Also, I can't find an implementation of this command in cmd.
Tell me, what are the options other than direct access to cmd from the script?

Answer 1

The end goal is not entirely clear. If you want another file to appear at the end of one file, then in Python you need to do this:
1. Read file 1, 2; (rb)
2. Calculate the length of file 1: (_lenght_)
3. Write file 1 to file 2 at the length offset of the first one. (wb)
if you need to call a program from cmd, then do not forget python.exe proga.py. Or add python to environment variables (Windows). It works on Linux by default.