input: 
  from typing import List
  
  
  def generate_random_string(string_length: int) -> str:
      """ Generates a random string of specified length containing alphanumeric characters.
      >>> generate_random_string(10)
      'A11b2cx3Dd'
      """
      random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      random_string = ''.join(random.choices(random_characters, k=string_length))
      return random_string
  
output:     import random
      random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      random_string = ''.join(random.choices(random_characters, k=string_length))
      return random_string