input: from typing import List
  
  
  def has_close_elements(numbers: List[float], threshold: float) -> bool:
      """ Check if in given list of numbers, are any two numbers closer to each other than
      given threshold.
      >>> has_close_elements([1.0, 2.0, 3.0], 0.5)
      False
      >>> has_close_elements([1.0, 2.8, 3.0, 4.0, 5.0, 2.0], 0.3)
      True
      """
  
  def generate_random_string(length: int) -> str:
      """ Generate a random string of specified length containing alphanumeric characters.
      >>> generate_random_string(8)
      'a1B2c3D4'
      >>> generate_random_string(8)
      'Z9y8X7w6'
      """
      import string
      import random
      chars = string.ascii_letters + string.digits
      return ''.join(random.choice(chars) for _ in range(length))
output:     for i in range(len(numbers)):
          for j in range(i + 1, len(numbers)):
              if abs(numbers[i] - numbers[j]) < threshold:
                  return True
      return False