call a variable from one function to another ...

[Windspar]

Roughly. Low level stuff.
Anytime a function return a variable.
It is put on the stack.
Function closes.
Then stack item is assign to variable.

---

python bytecode.

import os
import dis

def qassam():
    filename = "/root/Downloads/scapy.txt"
    return filename


def fileex():
    filename = qassam()
    if os.path.isfile(filename):
        print("is there")
    else:
        print("else ... ")

dis.dis(fileex)

Output:
 10           0 LOAD_GLOBAL              0 (qassam)
              2 CALL_FUNCTION            0
              4 STORE_FAST               0 (filename)

 11           6 LOAD_GLOBAL              1 (os)
              8 LOAD_ATTR                2 (path)
             10 LOAD_METHOD              3 (isfile)
             12 LOAD_FAST                0 (filename)
             14 CALL_METHOD              1
             16 POP_JUMP_IF_FALSE       28

 12          18 LOAD_GLOBAL              4 (print)
             20 LOAD_CONST               1 ('is there')
             22 CALL_FUNCTION            1
             24 POP_TOP
             26 JUMP_FORWARD             8 (to 36)

 14     >>   28 LOAD_GLOBAL              4 (print)
             30 LOAD_CONST               2 ('else ... ')
             32 CALL_FUNCTION            1
             34 POP_TOP
        >>   36 LOAD_CONST               0 (None)
             38 RETURN_VALUE