input: Write a function to raise an exception if the input value is not an integer. If the input value is an integer, return the square root of the input value.
  
  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(9)==3.0
  assert square_root("4")==TypeError('Input must be an integer')
  assert square_root(16)==4.0
output: def square_root(x):
      if not isinstance(x, int):
          raise TypeError('Input must be an integer')
      return x**0.5