input: Write a function to print the following output pattern. The function should print a number pattern where each line `i` contains numbers from 1 to `i`.
  assert print_number_pattern()==None
  #### Output:
  1
  12
  123
  1234
  12345
output: def print_number_pattern():
      for i in range(1, 6):
          for j in range(1, i + 1):
              print(j, end='')
          print()