input: def square_root(x):
      """
      Returns the square root of a given integer. If the input is not an integer, raises a TypeError exception.
      >>> square_root(4)
      2.0
      >>> square_root(9)
      3.0
      >>> square_root('a')
      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