Python 3.4 password generator

Question

I'm pretty new to Python and I made a password generator. I would like you to check it out and give me tips on how I could do it better.

import random


def small():  # Prints a generated string of 6 chars

    list = ("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "L", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
    "V", "W", "X", "Y", "Z", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "a", "b", "c", "d", "e", "f",
    "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
    "v", "w", "x", "y", "z")

    generatepassword = random.choice(list) + random.choice(list) + random.choice(list) + random.choice(list) +\
               random.choice(list) + random.choice(list)

    print(generatepassword)
    print("The passwords consists of: " + str(len(generatepassword))+" Characters")
    print("\n")


def med():  # Prints a generated string of 10 chars

   list2 = ("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "L", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
     "V", "W", "X", "Y", "Z", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "a", "b", "c", "d", "e", "f",
     "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
     "v", "w", "x", "y", "z")

   generatepassword = random.choice(list2) + random.choice(list2) + random.choice(list2) + random.choice(list2) +\
               random.choice(list2) + random.choice(list2) + random.choice(list2) + random.choice(list2) +\
               random.choice(list2) + random.choice(list2)

   print(generatepassword)
   print("The passwords consists of: " + str(len(generatepassword))+" Characters")
   print("\n")


def big():  # Prints a generated string of 32 chars

    list3 = ("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "L", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
     "V", "W", "X", "Y", "Z", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "a", "b", "c", "d", "e", "f",
     "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
     "v", "w", "x", "y", "z")

    generatepassword = random.choice(list3) + random.choice(list3) + random.choice(list3) + random.choice(list3) +\
               random.choice(list3) + random.choice(list3) + random.choice(list3) + random.choice(list3) +\
               random.choice(list3) + random.choice(list3) + random.choice(list3) + random.choice(list3) +\
               random.choice(list3) + random.choice(list3) + random.choice(list3) + random.choice(list3) +\
               random.choice(list3) + random.choice(list3) + random.choice(list3) + random.choice(list3) +\
               random.choice(list3) + random.choice(list3) + random.choice(list3) + random.choice(list3) +\
               random.choice(list3) + random.choice(list3) + random.choice(list3) + random.choice(list3) +\
               random.choice(list3) + random.choice(list3) + random.choice(list3) + random.choice(list3)

    print(generatepassword)
    print("The passwords consists of: " + str(len(generatepassword))+" Characters")
    print("\n")

def generate():  # This askes how long the password should be

    print("How big do you want your password? choices >> [6], [10], [32]")
    choice = input("please input the lenght >> ")

    while choice != '6' and choice != '10' and choice != '32':
         choice = input("please choose: [6], [10] or [32] >> ")

        if choice == '6':
          break

        elif choice == '10':
          break

        elif choice == '32':
          break

   if choice == '6':
       small()

   if choice == '10':
       med()

   if choice == '32':
       big()

again = 'yes'
while again == 'yes' or again == 'y':

  # From here on the user can choose to generate another password
  # If the person typed yes or y then it will run the def function generate
  # And it will restart
  # If the user types anythin else then yes or y then the program quits

  generate()
  print("\n")
  print("Do you want to generate another password? [yes] or [no] >> ")
  again = input()

Answer 1

Summary:

• If you have multiple function that does similar tasks, make it as one that passes an arg.
• If you have to repetitively type the something over and over again, there's probably a better way to do it
• Include some error checking in spots such as input()
• Take advantage of the string module. For example: string.ascii_letters is the same as 'abcdef...ABCDEF...'

Note to the OP:

Here's a more concise version of your code. I also made it be able to take any amount of length. Read the comments cause they explains every change I made

import random
import string

def gen_pass(length):  # Prints a generated string of any length of chars

    # don't name anything list or other type name. Use a name like word_list instead
    word_list = list(string.ascii_letters+string.digits) # use string module to make it shorter, so you dont need to type everything


    generatepassword = "".join([random.choice(word_list) for i in range(length)]) # typing the same thing over and over again is redundent
                                                                        # use a variable for the length instead of making multiple functions 

    print(generatepassword)
    print("The passwords consists of: {} Characters\n".format(length)) # use str.format instead of + to make it look neater.
                                                            # isn't length the same as len(generatepassword)?                                                                                        
                                                    # add the \n on to the previous print statement

# don't need the other functions now


def generate():  # This askes how long the password should be

    print("How long do you want your password? ") # now it supports any length of password
    while 1: # do some checking, while 1 is an infinite loop until it's breaked
        try: # do some error checking as well
            choice = int(input("please input the length >> ")) # make it an integer
            if choice < 1: # should not be less than 1
                raise TypeError()

        except TypeError: # if choice < 1:
            print("Length should not be less than 1") # show an error message

        except ValueError: # if choice is not a number:
            print("Please input a valid integer") # show an error message

        except:
            print("Some other error occured... :(") # show an error message if some other error occured, though I don't think it's possible

        else:
            break # if no error occured

    gen_pass(choice) # generates a password with any length
    # everything else isn't needed 

again = 'yes'
while again.lower() in ['yes','y']: # use lower in case they capped it, use this kind of checking method
  generate()
  again = input("\nDo you want to generate another password? [yes] or [no] >> ") # put the print statements inside the input()

Answer 2

1. Please read documentation, random has a usage warning at the top of the documentation:

   Warning: The pseudo-random generators of this module should not be used for security purposes. Use os.urandom() or SystemRandom if you require a cryptographically secure pseudo-random number generator.

2. Use string formatting, this simplifys the creation of strings.

3. Have a standard for your indentation. I'm honestly surprised this code runs with your tabbing.
4. You can simplify your equality checks, rather than doing a == b or a == c, you can use a in {b, c}. I use a set due to the peephole optimization.
5. Use loops, if you use for _ in range(amount) you can reduce your code significantly.
6. Move duplicate code into one function, in this case move your prints of the password out of; small, med, and big. And put it in generate.
7. Make a single function to be able to make any sized input.
8. Change generate to account for this.
9. Use a main. You want to keep things out of global scope, so it's as small as possible. This can lead to performance improvements.
10. Protect your main function with a if __name__ == '__main__': guard.
11. You can simplify the for loop to a list comprehension, this documentation may be easier to understand.
12. You can define your letters as a global constant, so that if you do need them again later, you can use the one we've defined. And so if at a later date you want to add or remove letters, then you can without having to change multiple strings.

import random
r = random.SystemRandom()
r.choice()

LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyz"

def choice_over(letters, amount):
    choice = r.choice
    return ''.join(choice(letters) for _ in range(amount))


def generate():
    print("How big do you want your password?")
    while True:
        try:
            choice = int(input("please input the length >> "))
            break
        except ValueError:
            print('Please enter a number.')
    generatepassword = choice_over(LETTERS, choice)
    print(generatepassword)
    print("The passwords consists of: {} Characters".format(len(generatepassword)))
    print("\n")

def main():
    again = 'yes'
    while again in {'yes', 'y'}:
        generate()
        print("\n")
        print("Do you want to generate another password? [yes] or [no] >> ")
        again = input()

if __name__ == '__main__':
    main()