General programming question (input string)[

[jamie_01]

#!/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,

      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.

#!/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']