input: def square_root(x):
      """ Modify the following Python code to raise an exception if the input value is not an integer
      >>> square_root(4)
      2.0
      >>> square_root('4')
      Traceback (most recent call last):
          ...
      TypeError: Input must be an integer
      """
output:     if not isinstance(x, int):
          raise TypeError("Input must be an integer")
      return x ** 0.5