How to glue (stitch) two python code together?

Question

I am wondering what is the best way to put together codes from different python files into a new python file. Lets say the first file 1.pywould consist of:

def(...):
    a=1
    b=2
    return c=a+b

And another file 2.py consists of:

def(...):
    d = 4
    e = c*d
    return e

Now let's say you have a final file, final.py, which you want all the codes from 1.py and 2.py copied word by word to it in a specific order of operation where it looks as below. Note that I understand we can use the import function in python but in this case, I would like the whole text of certain definitions to be copied to the new python code. In another term, glue the codes from different files to build a new file.

final.py:

def(...):
    a=1
    b=2
    return c=a+b
def(...):
    d = 4
    e = c*d
    return e

EDIT:

Rephrase above: what if file 1 has 100 definitions and file 2 has 100 definitions but I want specific ones from each file copied over to file 3 with full text and syntax in a specified order.

Answer 1

If you're on a unix shell:

cat 1.py 2.py > 3.py