input: def print_number_pattern():
      """Prints a number pattern where each row contains numbers from 1 to row number
      Example:
      >>> 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()