import subprocess

networkPath = r"Reporting"
user="----"
password="----"

winCMD = 'NET USE V:' + networkPath + ' /User:' + user + ' ' + password
subprocess.Popen(winCMD, stdout=subprocess.PIPE, shell=True)

doc.save(r"C:\Users\----\Desktop\Double Check Royalties\%s.pdf" % (file_output))
shutil.copy2(r"C:\Users\----\Desktop\Double Check Royalties\%s.pdf" % (file_output), "V:\\" + networkPath + "\%s\%s.pdf" % (save_file_string, file_output))