code: def gen_rand_str(*size, use=None, keyspace=None):
      
      keyspace = keyspace or (string.ascii_letters + string.digits)
      keyspace = [char for char in keyspace]
      use = use or _random
      use.seed()
      if size:
          size = size if len(size) == 2 else (size[0], size[0])
      else:
          size = (10, 12)
      return ''.join(
          use.choice(keyspace)
          for _ in range(use.randint(*size)))
docs: Generates a random string using random module specified in @use within
          the @keyspace
  
          @*size: #int size range for the length of the string
          @use: the random module to use
          @keyspace: #str chars allowed in the random string
          ..
              from vital.debug import gen_rand_str
  
              gen_rand_str()
              # -> 'PRCpAq'
  
              gen_rand_str(1, 2)
              # -> 'Y'
  
              gen_rand_str(12, keyspace="abcdefg")
              # -> 'gaaacffbedf'
          ..