Don't code in Bash, learn to use system calls in Python.

system_calls_template.py

#!/usr/bin/env python3

import sys, os, shutil, subprocess, logging

# Set logging level; log everything.
logging.basicConfig(level=logging.INFO)

# Define some inputs.
input1 = sys.argv[1]
input2 = sys.argv[2]

# Try creating a new folder.
some_path = 'some_path_goes_here'
try:
    os.mkdir(some_path)
except FileExistsError:
    logging.warning('Working directory "%s" already exists.' % some_path)

# Navigate to the new folder.
os.chdir(some_path)

# We will try to make a new file.
# Check if this file already exists.
fn = 'testfile.txt'
if os.path.isfile(fn):
    logging.warning('File "%s" already exists.' % fn) 

# Run a command, producing a new file.
cmd = 'echo %s %s > %s' %(input1, input2, fn) 
subprocess.call(['/bin/sh', '-c', cmd])

# Copy the file.
shutil.copy(fn, 'testfile_copy.txt')