input: Write a function to raise a TypeError exception if the input value is not an integer. The function should return the square root of the input if it is an integer. If the input is not an integer, the exception message should be 'Input must be an integer'.
  assert square_root(4)==2.0
  assert square_root(9)==3.0
  assert square_root(25)==5.0
  try:
      square_root(3.5)
  except TypeError as e:
      assert str(e)=='Input must be an integer'
  try:
      square_root('a')
  except TypeError as e:
      assert str(e)=='Input must be an integer'
output: def square_root(value):
      if not isinstance(value, int):
          raise TypeError('Input must be an integer')
      return value ** 0.5