[Python] Python access and list the files in network share with username and password

I would like to get list of filenames(Only) from the given FileShare location using Python Language. Here is my Code snippet, but it is not running listing any files.

import os
from os import walk
SQLSR_USER= 'username'
SQLSR_PASS= 'password'
BACKUP_REPOSITORY_PATH= '\\fileshare\location'
fileList = []
backup_storage_available = os.path.isdir(BACKUP_REPOSITORY_PATH)
if backup_storage_available:
print("Backup storage already connected.")
else:
print("Connecting to backup storage.")

mount_command = "net use /user:" + SQLSR_USER + " " + BACKUP_REPOSITORY_PATH + " " + SQLSR_PASS
os.system(mount_command)
backup_storage_available = os.path.isdir(BACKUP_REPOSITORY_PATH)
if backup_storage_available:
print ("Connection success.")
else:
raise Exception("Failed to find storage directory.")

for (dirpath, dirnames, filenames) in walk(backup_storage_available):
fileList.extend(filenames)
break

if (len(fileList) > 1):
print "\n\n *********************Required data files are present in the FileShare*********************"

else:
print "\n\n ********************* No files are present to start the Next Run *********************"


Still I have a Problem with NET USE connection command listed down

mount_command = "net use /user:" + SQLSR_USER + " " + BACKUP_REPOSITORY_PATH + " " + SQLSR_PASS
os.system(mount_command)
backup_storage_available = os.path.isdir(BACKUP_REPOSITORY_PATH)

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