Shelve problems

import os, shutil, shelve, time

#Backup.py
#Backs shit up

def BackUpAll (path, bupath):

    #Gets the name from the original folder and makes a new one
    names = os.path.split(path)
    new_name = names[1]+' '+GetTime()
    new_path = bupath + "\\" + new_name

    print("Copying files from %s to %s"%(path,new_path))
    #shutil.copy(path,new_path)


def CheckBUPath ():
    """Gets a path from user and checks if it's empty.
    If not, it asks the user if he wants to change it."""
    create_path=True
    while create_path:
        #Creating Backup path
        print("Where would you like to create your backup?")
        path = MakePath()
        os.chdir(path)

        #Checking if something already exists at that path
        if len(os.listdir()) >= 1:
            print("\nSomething already exists there: ")
            resume = Walkpath(path,"Short")
            print("%d folders and %d documents\n"%(resume[0],resume[1]))
            print('Would you like to change your location?')
            answer = YesNo()
            if answer =="YES" or answer =="Y":
                continue
            elif answer =="NO" or answer =="N":
                break
        else:
            print("The path is empty! Proceeding with setup...")

    return path


def GetTime():
    """Gets the time in a DD/MM/YY-HH/MM/SS format"""
    date = time.strftime("%x")
    hour = time.strftime("%X")
    full_time  = date+'-'+hour
    return full_time


def MakePath ():
    """Gets a valid path from user."""
    while True:
        path = input("Enter path here: ").strip(' ')
        if not os.path.exists(path):
            print("That path does not exist, please enter a valid path.")
        else:
            break
    return path


def Setup():
    """Walks the user through setting a path location and other settings"""

    print("We will walk you around creating your backup and backup preferences\n")

    #Setting the directory to be backed up
    print("What directory would you like to backup?")
    path = MakePath()

    print("Would you like to se all folders and files at that path? (enter YES|NO)")
    answer = YesNo()

    if answer =="YES" or answer =="Y":
        Walkpath(path)
    elif answer =="NO" or answer =="N":
        print("\n")
        print("Okay, let's proceed.")
    else:
        raise Exception ("Something went wrong with your answer")

    answer=""       #AnswerReset

    #Setting the backup directory
    bupath = CheckBUPath()
    print("Would you like to save this destination (%s) as your default backup location ?\
    That way you don't have to type it again."%bupath)
    answer = YesNo()

    if answer =="YES" or answer =="Y":
        WorkShelf('BackUpPath','store', bupath)

    else:
        print("Okay, let's proceed")

    answer = ""     #AnswerReset

    #Remembering files to be backed up location
    print("\nIf you're going to be backing the same data up\
    we can save the files location so you don't have to type all the paths again.")
    print("Would you like me to remember the backup file's location?")
    answer = YesNo()

    if answer =="YES" or answer =="Y":
        WorkShelf('Path2BU', 'store', path)

    else:
        print("Okay, let's proceed")

    answer = ""     #AnswerReset


    return path, bupath


def Walkpath (path, version = 'Long'):
    """Walks a path and prints out all the contents with structure.
    Also gives a short version with number of files and subfolders."""
    walk = os.walk(path)

    #Long
    if version == "Long":
        for (CurrentDir, Subdirs, Docs) in walk:
            print('___________\n')
            print('CURRENT FOLDER: ',CurrentDir)

            if len(Subdirs) >= 1:
                print("This folder (%s) contains the following subfolders: "%CurrentDir)
                for subdir in Subdirs:
                    print("\t-", subdir)
            else:
                print("No subfolders found")

            if len(Docs) >= 1:
                print("This folder (%s) contains the following documents: "%CurrentDir)
                for doc in Docs:
                    print("\t-", doc)
            else:
                print("No documents found")
        print('\n'*4)

    #Short
    elif version == "Short":
        nb_subs, nb_docs = 0,0
        for (CurrentDir, Subdirs, Docs) in walk:
            for subdir in Subdirs:
                nb_subs += 1
            for doc in Docs:
                nb_docs += 1

        resume = [nb_subs, nb_docs]
        return resume

    else:
        raise Exception ('Error in Backup.Walkpath')


def WorkShelf(key, mode='get', variable=None):
    """Either stores a variable to the shelf or gets one from it.
    Possible modes are 'store' and 'get'"""
    config = shelve.open('Config')

    if mode.strip() == 'get':
        print(config[key])
        return config[key]

    elif mode.strip() == 'store':
        config[key] = variable
        print(key,'holds',variable)

    else:
        print("mode has not been reconginzed. Possible modes:\n\t- 'get'\n\t-'store'")

    config.close()


def YesNo ():
    """Gets a valid YES/NO answer from user."""
    while True:
        answer = input("> ").upper().strip(' ')

        if answer == "YES" or answer == "Y" or answer == "NO" \
        or answer == "NOPE" or answer == "N":
            break
        else:
            print("You did not enter a valid answer. Possibilities are yes/y|no/nope/n")

    return answer

#       MAIN


print("Welcome to this backup manager.")
if False: #First Time
    path, bupath = Setup()
    BackUpAll(path, bupath)
else:
    os.chdir(r"W:\Users\Damien\Documents\Code\Code Pyth")
    config = shelve.open('Config')
    path = config['Path2BU']
    bupath = config['BackUpPath']
    #path, bupath = WorkShelf('Path2BU'), WorkShelf('BackUpPath')
    print(path, bupath)
    BackUpAll(path, bupath)