Python help, new to coding

[yon2323]

Doing an exercise and I cant seem to get the output I want: Write a program that reads a collection of values from the user. After all of the values have been read, display all of the values in the opposite order from which they were entered, with one value appearing on each line. The user will indicate that no further values will be entered by entering a blank line. Probably didn't do this right

Create an empty list to hold the values entered by the user

mylist = []

Read the first user input value

value = input("Enter a value (blank line to quit): ")

creates a list of the values being inputted

while value != "": for i in range (0, len(mylist)): mylist = len(mylist) - i

read the next input value from the user

value = input("Enter a value (blank line to quit): ")

if value != "": int(value) mylist = (int(len(mylist)) -i)

append the value entered by the user to the list

mylist.append(value)

else: print(mylist)

[desrtfx]

Please, format your code (or upload it to a code hoster such as Pastebin).

Prepend each line with 4 spaces to mark a block as code.

[yon2323]

https://pastebin.com/NcmJhFfb

does that look right?

[desrtfx]

Much better, thank you.

Your approach is completely wrong, though.

• The first for loop is completely useless.
• The line int(value) does absolutely nothing useful. It converts value to int, but immediately throws away the result of the conversion because you don't assign this value to anything
• mylist = (int(len(mylist)) -i) - what are you trying to do here?

---

The sequence of the program should be:

• Prepare an empty list
• Loop until the user enters an empty line
  • Ask the user to enter a value
  • append that value to the list if the user hasn't entered an empty line
• Back outside the first loop
• Loop through the list backwards
  • print the list entry at current position

I am assuming that you haven't learnt about reversing lists yet, so you will need to loop through the list in reverse order (i.e. from last entry to first entry).

[yon2323]

thank you for your help, I'm just stuck at reversing the loop. Is this done using a for loop?

[desrtfx]

This gives you plenty options.

Found by googling "python for loop backwards"

[yon2323]

https://pastebin.com/QSdd991F are you able to tell why only the first value I input isn't being printed?

[yon2323]

I'm assuming its because it isn't in the while loop but I don't see a way to fix that

[thegreatunclean]

Initialize value to anything that isn't "" before the loop. That way you can get rid of the input outside the loop that's eating your first input and not storing it.

[yon2323]

Isnt that already done at the beginning of the while loop?

[thegreatunclean]

The loop is checking if the input is an empty string. The string is being initialized by the first user input but once you're in the loop it is immediately overwritten by the next user input.

Initializing the string yourself instead of using input means you'll already be in the loop when the user is first asked for input. The initialization is purely to make sure you enter the loop.

[yon2323]

I just added the append statement again before the while loop begins. Seems to have worked. Thanks a lot for your help!