python random string generation with upper case letters and digits

Question

Hello, I want to generate string with N size.

It should be made up of numbers and upper case english letters such as:

• 6U1S75
• 4Z4UKK
• U911K4

How can I achieve this in a pythonic way ?

Thanks

Answer 1

''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(N))

Answer 2

Taking the answer from Ignacio, this works with python 2.6:

import random
import string

N=6
print ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(N))

Example output: JQUBT2

Answer 3

1. Better way is to use random.sample(if you are ok with no repetition, which could be good)
2. Do not add lists in every iteration

e.g.

import random
import string

char_set = string.ascii_uppercase + string.digits
print ''.join(random.sample(char_set,6))