General programming question (input string)[

[jamie_01]

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#!/usr/bin/python3   list_item_two = ['apples', 'oranges', 'pears', 'apricots']   list_item_two.append("celery")   print("ADD (1) or REMOVE (2) elements\n")   user_input = input("> ")   if user_input == "1":     print("Add Element to List")     special_val = "add" elif user_input == "2":     print("Remove Element to List")     special_val = "remove"   i = 1   while i < 4: # Output list     for fruit in list_item_two:       print(f"{i} fruit of type: {fruit}")       i += 1   print("\nLength of elements: ", len(list_item_two))   input_val = input(f"What element to {special_val}? ") # if add or remove   # insert element i = 1 while i < 2:     if special_val == "add":       list_item_two.insert(0, input_val)       elif special_val == "remove":       list_item_two.remove(input_val) # this works       i += 1   print("Now the list is: ", list_item_two)

please, this line right here,

1	list_item_two.insert(0, input_val)

Is there a better way to write so the code runs successfully, currently under Debian Linux the program is hanging after typing '1' (ADD'ing an element) after program execution. Thanks!

[bowlofred]

Your insertion while loop (line 31) has no exit unless i >= 2.

But the "add" section does not modify i. So if you enter the loop with special_val == "add", there is no way to terminate.

I don't understand why there is a while loop there at all. Is there a case where you would expect to run the insertion or removal more than one time? Why not just get rid of the while?

[BashBedlam]

@bowlofred is correct. Remove the loop and you code performs as expected.

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#!/usr/bin/python3    list_item_two = ['apples', 'oranges', 'pears', 'apricots']    list_item_two.append("celery")    print("ADD (1) or REMOVE (2) elements\n")    user_input = input("> ")    if user_input == "1":     print("Add Element to List")     special_val = "add" elif user_input == "2":     print("Remove Element to List")     special_val = "remove"    i = 1

Output:
ADD (1) or REMOVE (2) elements

> 1
Add Element to List
1 fruit of type: apples
2 fruit of type: oranges
3 fruit of type: pears
4 fruit of type: apricots
5 fruit of type: celery

Length of elements:  5
What element to add? grapes
Now the list is:  ['grapes', 'apples', 'oranges', 'pears', 'apricots', 'celery']