[Python] Python to zip and backup files but no files found

I am just beginning to learn Python and is following the example in the book "A Byte of Python". The example is to zip and backup files to a folder. The program did create a zip file but no file is stored inside. I tried running the same command within the Command Prompt and it is the same. Why is it so?

Below is the code:

import os
import time


source = ['C:\\Test', 'C:\\Code']

target_dir = 'C:\\Backup'

target = target_dir + os.sep + \
time.strftime('%Y%m%d%H%M%S') + '.zip'

if not os.path.exists(target_dir):
os.mkdir(target_dir)


zip_command = 'zip -r {0} {1}'.format(target,' '.join(source))

print('Zip command is:' + '\n' + zip_command)
print('Running:')
if os.system(zip_command) == 0:
print('Successful backup to', target)
else:
print('Backup FAILED!')


Below is the output:

Zip command is:
zip -r C:\Backup\20250907205502.zip C:\Test C:\Code
Running:
adding: C:\Test/ (stored 0%)
adding: C:\Test/New Microsoft Excel Worksheet.xlsx (deflated 15%)
adding: C:\Test/New Microsoft Word Document.docx (stored 0%)
adding: C:\Code/ (stored 0%)
adding: C:\Code/New Text Document (2).txt (stored 0%)
adding: C:\Code/New Text Document.txt (stored 0%)
Successful backup to C:\Backup\20250907205502.zip


Thank you.

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