input: Write a function to calculate the square root of a user-defined positive number.
  
  assert math.isclose(calculate_square_root(100), 10.0)
  assert math.isclose(calculate_square_root(25), 5.0)
  assert math.isclose(calculate_square_root(225), 15.0)
  assert math.isclose(calculate_square_root(49), 7.0)
  assert math.isclose(calculate_square_root(64), 8.0)
output: def calculate_square_root(number):
      return number ** 0.5