for loop in python

[Steven D'Aprano]

On Thu, 28 Apr 2016 07:34 pm, g.v.aarthi at skct.edu.in wrote:

> start_list = [5, 3, 1, 2, 4]
> square_list = []

Here you set square_list to a list.

> # Your code here!
> for square_list in start_list:
.....^^^^^^^^^^^^^

Here you set square_list to each item of the start_list. So the first time
around the loop, you have:

    square_list = 5

The second time:

    square_list = 3

The third time:

    square_list = 1

and so on. Except that the next line:

>    x = pow(start_list, 2)

tries to raise *start_list* to the power of 2:

[5, 3, 1, 2, 4]**2

which will raise an exception:

> TypeError: unsupported operand type(s) for ** or pow(): 'list' and 'int'



So you need to do this:


start_list = [5, 3, 1, 2, 4]
square_list = []

# Your code here!
for ????? in start_list:

Choose a different name! Not one you have already used. Something
like "value" or "x" or "the_number_we_want_to_square".

   x = pow(?????, 2)
   square_list.append(x)


And you only need to sort the square list once, at the end, *outside* of the
for-loop, not inside it. (No need to indent the sort line.)




-- 
Steven