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