input: 
  def print_number_pattern() -> None:
      """
      Prints a number pattern where each line contains numbers from 1 to the line number.
  
      >>> print_number_pattern()
      1
      12
      123
      1234
      12345
      """
      for i in range(1,6):
          for j in range(1,i+1):
              print(j, end="")
          print()
  
output:     for i in range(1, 6):
          for j in range(1, i + 1):
              print(j, end="")
          print()