#This is the phonebook
#Usernmae , password
def options():
    print "1.Print phone number"
    print "2.Add a phone number"
    print "3.Remove a phone number"
    print "4.Lookup a phone number"
    print "5.Edit a name" 
    print "6.Quit"


menu_choice = 0
numbers = {}

print options()

menu_choice = input("Pick an option from the menu(1-5) : ")

while menu_choice != 6:
    if menu_choice == 1:
        print "Telephone numbers:"
        for x in numbers.keys():
            print "Name: ",x,"\tNumber: ",numbers[x]
            print
    elif menu_choice == 2:
        name = raw_input("Enter the name you wanna add : ")
        number = input("Enter number : ")
        numbers[name] = number
        options()
        menu_choice = input("Pick an options from the menu(1-5) : ")
    elif menu_choice ==3:
        del_name = raw_input("Enter the name you would like to del : ")
        if numbers.has_key(del_name):
            del numbers[del_name]
        options()
        menu_choice = input("Pick an options from the menu(1-5) : ")
    elif menu_choice ==4:
        look_name = raw_input("Enter the number : ")
        if numbers.has_key(look_name):
            print numbers[look_name]
        options()
        menu_choice = input("Pick an options from the menu(1-5) : ")
    elif menu_choice ==5:
        change_name = raw_input("Whats the name you would like to change : ")
        for change_name in numbers.keys():
            new_name = raw_input("New name : ")
            numbers[change_name] = new_name
        else:
            print "Name cannot be found"
    elif menu_choice!=6:
        options()
        menu_choice = input("Pick an options from the menu(1-5) : ")

for x in numbers.keys():
            print "Name: ",x,"\tNumber: ",numbers[x]

This is the code :
for change_name in numbers.keys():
            new_name = raw_input("New name : ")
            numbers[change_name] = new_name  # <---I know this is worng 
        else:                                              #but don't know any other way
            print "Name cannot be found"

for x in numbers.keys():
            print "Name: ",x,"\tNumber: ",numbers[x]

This is the code :
for change_name in numbers.keys():
            new_name = raw_input("New name : ")
            numbers[change_name] = new_name  # <---I know this is worng 
        else:                                              #but don't know any other way
            print "Name cannot be found"

for change_name in numbers.keys():
            new_name = raw_input("New name : ")
            numbers[change_name] = new_name  # <---I know this is worng 
        else:                                              #but don't know any other way
            print "Name cannot be found"

# Functions can return values - if you're repeating code you should
# DEFINITELY use one. (repeated prints are somewhat bad but they 
# can stand for the moment)
#
# Always use raw_input() - input() is fragile and insecure.
def get_option():
    print
    print "1.Print phone number"
    print "2.Add a phone number"
    print "3.Remove a phone number"
    print "4.Lookup a phone number"
    print "5.Edit a name" 
    print "6.Quit"
    return raw_input("Pick an option from the menu(1-5) : ")

# Even when chunks of code aren't repeated, using a function can clarify
# your code by pulling out units of functionality.
# In Python, you almost never need to explicitly index
def print_number():
    print "Telephone numbers:"
    for name, number in numbers.items():
        print "    Name: %s\tNumber: %s" %(name, number)

def add_number():
    name = raw_input("Enter the name you wanna add : ")
    number = raw_input("Enter number : ")
    numbers[name] = number

# You can just use "obj in container" rather than "container.has_key(obj)"
# It works for lists as well as dicts.
def remove_number():
    del_name = raw_input("Enter the name you would like to del : ")
    if del_name in numbers:
        del numbers[del_name]

def lookup_number():
    look_name = raw_input("Enter the name : ")
    if look_name in numbers:
        print numbers[look_name]

# You want to replace the old name with the new name.
# This means that the old name needs to be removed.
# dict.pop() removes an object from the dict and returns it.
# the object that's returned is then allocated to new_name
def edit_name():
    change_name = raw_input("Whats the name you would like to change : ")
    if change_name in numbers:
        new_name = raw_input("New name : ")
        numbers[new_name] = numbers.pop(change_name)
    else:
        print "Name cannot be found"
    
numbers = {}

# Python has first class functions - this means that a function can be
# treated like any other object. You can thus put them in a lookup table
mytable = { "1": print_number,
            "2": add_number,
            "3": remove_number,
            "4": lookup_number,
            "5": edit_name }

# It's cleaner to loop infinitely and only have ONE call to get_option.
while True:
    menu_choice = get_option()

    # try to lookup the menu choice in the lookup table
    try:
        func = mytable[menu_choice]
    # If the lookup fails
    except KeyError:
        # break out of the infinite loop if choice is "6"
        if menu_choice == "6":
            break
        # Otherwise print an error message
        else:
            print "Incorrect value - must use 1 to 6 only."
    # the else clause will ONLY be called if no exceptions were raised
    else:
        # We can now call the function that we looked up
        func()

import sys

mytable = { "1": print_number,
            "2": add_number,
            "3": remove_number,
            "4": lookup_number,
            "5": edit_name,
            "6": sys.exit }

# It's cleaner to loop infinitely and only have ONE call to get_option.
while True:
    # try to lookup the menu choice in the lookup table
    try:
        mytable[get_option()]()
    # If the lookup fails
    except KeyError:
        print "Incorrect value - must use 1 to 6 only."

#This is a phonebook

number = {}

def menu():
    print "1.Print the phone book"
    print "2.Add a number"
    print "3.Delete a number"
    print "4.Edit a number"
    print "5.Lookup for a number"
    print "6.Quit"
    return raw_input("Pick an option(1-6) frm the menu : ")

def print_number():
    print "Telephone number:"
    if len(number) > 0:
        for name in number.keys():
            print "   Name : ",name ,"\tNumber : ",number[name]
            print "-"*48
    else:
        print "You have no numbers in your phonebook"
        print "-"*48
def add_number():
    print '+------------------Add number---------------------+'
    print
    add_name = raw_input("Name : ")
    add_number = raw_input("Number : ")
    number.setdefault(add_name,add_number)
    print add_name," has been added."
    print "-"*48
    

def del_number():
    print "+-----------------Del number----------------------+"
    print
    for name in number:
        print " Name : ",name,"\tNumber : ",number[name]
        print
        print "Pick a name frm the list to delete"
        del_name = raw_input("Name : ")
    if number.has_key(del_name):
        del number[del_name]
        print del_name," has been deleted."
        menu()
    else:
        print "Choose a name from the phonebook"
        del_name = raw_input("Name : ")
        menu()

def edit_number():
    print "+---------------Edit a number---------------------+"
    print
    for name in number.keys():
        print "Name : ",name,"\tNumber : ",number[name]
    edit_name = raw_input("Name : ")
    if number.has_key(edit_name) == 1:
        new_name = raw_input("What would be the new name : ")
        number[new_name] = number.pop(edit_name)
        print edit_name," has been chaged to ",new_name
        menu()
    else:
        edit_name = raw_input("Pick a name from the list : " )

def lookup_number():
    print "+-------------Lookup for a number----------------+"
    print
    lookup_name = raw_input("Whats the name your looking for : " )
    if number.has_key(lookup_name) == 1:
        for lookup_name in number.keys():
            print "Name : ",lookup_name," \t Number : ",number[lookup_name]
    else:
        print " The name isn't in your phonebook"




mytable = { "1" : print_number,
            "2" : add_number,
            "3" : del_number,
            "4" : edit_number,
            "5" : lookup_number,
            }

while 1==1:
    menu_choice = menu()

    try:
        func=mytable[menu_choice]
    except KeyError:
        if menu_choice == "6":
            break
        else:
            print "Pick a option frm (1-6) "
    else:
        func()