input: Write a function called `square_root` that takes an input `x` and returns the square root of `x`. If `x` is not an integer, the function should raise a `TypeError` with the message 'Input must be an integer'.
  
  assert square_root(4)==2.0
  assert square_root(9)==3.0
  try:
      square_root('a')
  except TypeError:
      assert True
  else:
      assert False
  try:
      square_root(2.5)
  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