input: Write a function to print the multiplication table of a given number.
  def print_multiplication_table(num):
      for i in range(1, 11):
          print('{0} x {1} = {2}'.format(num, i, num*i))
  
  assert print_multiplication_table(5) outputs:
  # 5 x 1 = 5
  # 5 x 2 = 10
  # 5 x 3 = 15
  # 5 x 4 = 20
  # 5 x 5 = 25
  # 5 x 6 = 30
  # 5 x 7 = 35
  # 5 x 8 = 40
  # 5 x 9 = 45
  # 5 x 10 = 50
  
  assert print_multiplication_table(7) outputs:
  # 7 x 1 = 7
  # 7 x 2 = 14
  # 7 x 3 = 21
  # 7 x 4 = 28
  # 7 x 5 = 35
  # 7 x 6 = 42
  # 7 x 7 = 49
  # 7 x 8 = 56
  # 7 x 9 = 63
  # 7 x 10 = 70
output: def print_multiplication_table(num):
      for i in range(1, 11):
          print('{0} x {1} = {2}'.format(num, i, num*i))