input: Write a function to raise an exception if the input value is not an integer, and return the square root of the input value if it is an integer.
  
  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(16)==4.0
  assert square_root(25)==5.0
  try:
      square_root('a')
  except TypeError:
      assert True
  else:
      assert False
output: def square_root(x):
      if not isinstance(x, int):
          raise TypeError('Input must be an integer')
      return x**0.5