Python script to download files & folders recursively from a remote host via FTP

Yi-Cam-backupFiles.py

#!/usr/bin/python

# Copyright (c) 2018, Tanmay Sonawane
#
# 3 clause/New BSD license: 
#   opensource: http://www.opensource.org/licenses/BSD-3-Clause
#   wikipedia: http://en.wikipedia.org/wiki/BSD_licenses
#
#-----------------------------------------------------------------------
# This script  allows to download all files and folders from a specific
# remote path to a local path recursively.
#
# I made this specifically to connect to my IP cam and download all video
# files to my NAS periodically.
# 
# Use:
# 	You should run this as a cron job. An easy way is to just put this file
# 	in your NAS's /etc/cron.hourly/ folder. (remove the file extension)
#
# You can follow me on Twitter (@tanmays).

import os
import time
from sets import Set
from ftplib import FTP

########### CHANGE THESE ########################

TITLE = 'Living Room Surveillance Videos' 

SERVER = 'xxx.xxx.xxx.xxx' # your remote device's IP. It's best if you assign a static IP to the remote device.		
USER = 'xxxx' # FTP username
PASS = 'xxxx' # FTP password

REMOTE_PATH = "/tmp/sd/record/" # path to copy files from, (ex. path is where the Yi Home 720p stores videos)
LOCAL_PATH = "/data/Videos/Surveillance/Living Room/" # local path, make sure the path is valid and folder exists (ex. path is where I store files on my NAS)

DELETE_AFTER_COPY = False # set true if you want to delete files from remote device after copying
NEW_FILES_ONLY = True # this will copy only new files, perfect for cron jobs

###########################################

def connectFTP(serverName, userName, passWord, remotePath, localPath, deleteRemoteFiles=False, onlyDiff=True):
	
	try:
		ftp = FTP(serverName)
	except:
		print "Couldn't find server"
	ftp.login(userName,passWord)
	ftp.cwd(remotePath)
	
	try:
		print "Connecting..."
		copyFiles(ftp, remotePath, localPath, deleteRemoteFiles, onlyDiff)
	except:
		print "Connection Error - on: " + timeStamp()
	
	print("Copying files from FTP complete. Closing FTP connection.")
	ftp.close() # Close FTP connection
	ftp = None

def copyFiles(ftp, remotePath, localPath, deleteRemoteFiles=False, onlyDiff=True):
	ftp.cwd(remotePath)
	lFileSet = Set(os.listdir(localPath))
	rFileSet = Set(ftp.nlst())
	transferListWithNewFiles = list(rFileSet - lFileSet)
	transferList  = ftp.nlst()

	for fileOrFolder in transferList:
		fullRemotePath = os.path.join(remotePath, fileOrFolder)

		# Check for directories first
		if is_FTP_Path_A_Directory(fullRemotePath, ftp):
			# Check if directory exists at local
			fullLocalPath = os.path.join(localPath, fileOrFolder)
			if os.path.isdir(fullLocalPath):
				# Directory exists in local too, copy  files
				copyFiles(ftp, fullRemotePath, fullLocalPath, deleteRemoteFiles, onlyDiff)
			else:
				# Create new directory
				os.makedirs(fullLocalPath)
				copyFiles(ftp, fullRemotePath, fullLocalPath, deleteRemoteFiles, onlyDiff)
		else:
			shouldCopy = False
			if onlyDiff:
				if fileOrFolder in transferListWithNewFiles:
					shouldCopy = True
			else:
				shouldCopy = True

			if shouldCopy == True:
				# Create full local & remote filepaths
				fullLocalFilePath = os.path.join(localPath, fileOrFolder)
				fullRemoteFilePath = os.path.join(remotePath, fileOrFolder)
				print("Copying file to local path: " + fullLocalFilePath)
						
				# Open a file on local disk to write to
				fileObj = open(fullLocalFilePath, 'wb')
				# Download the file a chunk at a time using RETR
				ftp.retrbinary('RETR ' + fullRemoteFilePath, fileObj.write)
				# Close the file
				fileObj.close()
					
				# Delete the remote file if requested
				if deleteRemoteFiles:
					ftp.delete(fullRemoteFilePath)


def timeStamp():
    return str(time.strftime("%a %d %b %Y %I:%M:%S %p"))

def is_FTP_Path_A_Directory(path, ftp):
    current = ftp.pwd()
    try:
        ftp.cwd(path)
    except:
    	ftp.cwd(current)
        return False
    ftp.cwd(current)
    return True

if __name__ == '__main__':
	print ("\n---- Executing Script to copy "+ TITLE +" ----\n")
	connectFTP(SERVER,USER,PASS,REMOTE_PATH,LOCAL_PATH,DELETE_AFTER_COPY,NEW_FILES_ONLY)

great job
I would like to add a small function not to delete the file of the day. how can I proceed
thank you in advance