“sample larger than population” in random.sample python

Question

creating a simple pass generator for myself, i noticed that if i want my population to be digits only (0-9) which is overall 10 options, if i want my length over 10, it wont

Answer 1

@Martijn Pieters is right. But since they state at https://docs.python.org/3.4/library/random.html:

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.

and the purpose of this is for generating passwords, I suggest this approach:

import string
import random

set = string.letters + string.digits + string.punctuation
length = 20

password = ''.join( [ random.SystemRandom().choice( set) for _ in range( length) ] )

print( password)

Could anybody please confirm that this is more secure?