input: Write a function to modify the following Python code to raise an exception if the input value is not an integer.
  
  ### Input:
  def square_root(x):
      return x**0.5
  
  ### Output:
  def square_root(x):
      if not isinstance(x, int):
          raise TypeError('Input must be an integer')
      return x**0.5
output: def square_root(x):
      if not isinstance(x, int):
          raise TypeError('Input must be an integer')
      return x**0.5