input: from random import choice
  import string
  
  def generate_password():
      """Generate a random password of length 8 characters, containing at least one lowercase letter, one uppercase letter and one number.
      
      Example:
      >>> generate_password()
      'A1b2C3d4'
      """
      chars = string.ascii_uppercase + string.ascii_lowercase + string.digits
      password = ''.join(choice(chars) for _ in range(8))
      if any(c.islower() for c in password) and any(c.isupper() for c in password) and any(c.isdigit() for c in password):
          return password
      else: 
          return generate_password()
output:     while True:
          password = ''.join(choice(chars) for _ in range(8))
          if any(c.islower() for c in password) and any(c.isupper() for c in password) and any(c.isdigit() for c in password):
              return password