Python Function not executing

Question

I am trying to understand why the output print(idx,item) is not given back on the shell, when I run this program in a python module.

def price_of_items():
 items=["pear","apple","grape"]
 prices_items=[]
 for i in items:
 price=int(input("Please enter the price of",+item))
 price_items.append(price)
 for idx, item in enumerate(price_items):
 print(idx,item)
 return
def main():
 option=""
 while option not in "X": #Loop control for when user doesnt exit program
 print("Main Menu")
 print()
 print("A/ItemPricing")
 print("X. Exit")
 option=input("Please select an option A or X from the Menus above")
 option=option.upper()
 while option not in ("A","X"):
 print("Invalid Input")
 option=input("Select either from A or from X")
 option-option.upper()
 if option=="A":
 price_of_items()
 else:
 exit()
 main()

• Matiiss: use while option != 'X' because if you check if an empty string is in another string, well, then it will be there because it doesn't take up any space
• hetepeperfan: is main called recursively from main?
• Guy: while option not in "X" is wrong, you never go into the loop. Use while option != "X"
• khelwood: The code as currently shown would give an indentation error. Any other expectation of its behaviour is based on guessing how it is actually supposed to be indented. Please post a minimal reproducible example.

Answer 1

I've edited your code a bit so it will work without errors:

• You are refrencing item without it being defined.
• The while loop should be while option != "X"
• The list you are refrencing in the function should be prices_items

Edited version:

def price_of_items():
 items = ["pear", "apple", "grape"]
 prices_items = []
 for item in items:
 price = int(input(f"Please enter the price of {e} "))
 prices_items.append(price)
 for idx, item in enumerate(prices_items):
 print(idx, item)
 return
def main():
 option = ""
 while option != "X": # Loop control for when user doesnt exit program
 print("Main Menu")
 print()
 print("A/ItemPricing")
 print("X. Exit")
 option = input("Please select an option A or X from the Menus above ")
 option = option.upper()
 while option not in ("A", "X"):
 print("Invalid Input")
 option = input("Select either from A or from X")
 option = option.upper()
 if option == "A":
 price_of_items()
 else:
 exit()
main()

Output flow:

Main Menu
A/ItemPricing
X. Exit
Please select an option A or X from the Menus above a
Please enter the price of pear 12
Please enter the price of apple 13
Please enter the price of grape 14
0 12
1 13
2 14
Main Menu
A/ItemPricing
X. Exit

• Matiiss: you kinda should add a bit of explanation as to what and why you changed exactly