[python] Random string generator

Read the rstr module documentation, there is an advice to use the SystemRandom to generate more secure random string.

from rstr import Rstr
from random import SystemRandom

rgen = Rstr(SystemRandom())

pattern = r"[0-9a-zA-Z]{16}"
pattern1 = r"\S{16}"

print(f"16 long alphanumeric password: {rgen.xeger(pattern)}\n"
      f"16 long all characters passord: {rgen.xeger(pattern1)}")