input: from typing import List
  
  def generate_string(length: int) -> str:
      """ Generates a random string of given length consisting of alphanumeric characters.
      >>> generate_string(5)
      'aB3d2'
      >>> generate_string(10)
      'X8Yz9pQ2R5'
      """
      random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      return ''.join(random.choices(random_characters, k=length))
output:     import random
      random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      return ''.join(random.choices(random_characters, k=length))