Python - random passwords

This program generates passwords on the size of 10 characters.
By using a function called "random_password" that creates a password of size 10 characters.
This function called "write_file" creates a file with automatic redial function "random_password. It contains a table of 10 X 10 random passwords.

from random import *
import string
chars = string.ascii_letters + string.digits
def random_password():
 a = "".join(choice(chars) for x in range(randint(10, 10)))
 b  = a + ' | '
 return b
def write_file():
 f = open('random_pass.txt', 'wr+')
 for c in range(10):
  rand=''
  for r in range(10):
   rand = rand + random_password() 
  randpass=rand + random_password() + '\n'   
  f.write(str(randpass))
 f.close()
write_file()