input: Write a function to check if the input value is an integer, and if not, raise a TypeError with the message 'Input must be an integer'. Return the square root of the input if it is an integer.
  def square_root(x):
      if not isinstance(x, int):
          raise TypeError('Input must be an integer')
      return x**0.5
  assert square_root(4) == 2.0
  assert square_root('string')
  assert square_root(9) == 3.0
  assert square_root(16) == 4.0
  assert square_root(25) == 5.0
output: def square_root(x):
      if not isinstance(x, int):
          raise TypeError('Input must be an integer')
      return x**0.5