File Backup & Verify (Mac/*nix)

fileboop.py

import os
import shutil
import hashlib

# Define variables
directory = raw_input( "Drag and drop the file or folder you want to back up." )    # Accepts input from user for source file path.
directory = directory.rstrip(" ") + "/"    # Formats variable.
backup_path = raw_input( "Drag and drop the location to which you want to back up." )    # Accepts input from user for destination file path.
backup_path = backup_path.rstrip(" ") + "/"    # Formats variable.
errnum = 0

def md5(filepath):    # md5 hash/checksum generator.
    return hashlib.md5(open(filepath, 'rb').read()).hexdigest()

# Creates a file on user's desktop to write/append transfer error filenames.
with open( "~/Desktop/backup_error_log.txt", "a" ) as errlog:
        for file in os.listdir(directory):    # For each item in the source directory...
                shutil.copytree(file, backup_path)    # ...copy it to the destination directory...
                if md5(file) != md5(backup_path + file):    # ...and check to make sure the file arrived unchanged.
                        errnum += 1    # If the hashes don't match add 1 to the error variable...
                        errlog.write(file)    # ...and record the filename of the file that did not copy correctly. 

print( "Backup completed! " + errnum + " errors occurred." )    # Notify user when script has finished and advise if there were errors.



# The lights dim, the play ends.

Changed copyfile to copy, to copy2, to copytree. May need to put the md5 check in a separate action.