Python list while loop check

Question

my aim is to run the while loop until the user inputs a option that is in my list. If they do the while loop should end.

exchangeCurrency = input("what currency would you like to convert to: ").upper()

myList = ["USD", "ERU", "BRL", "JPY", "TRY"]

while exchangeCurrency != myList:
    print("this is not a valid inpit")
    continue
else:
    break

Does this answer your question? Check if something is (not) in a list in Python — Ignatius Reilly
– Ignatius Reilly, Commented Oct 18, 2022 at 22:23

logan_9997 · Accepted Answer · 2022-10-18 22:20:19Z

3

while True:
    exchangeCurrency = input("what currency would you like to convert to: ").upper()
    if exchangeCurrency in myList:
        break

answered Oct 18, 2022 at 22:20

logan_9997

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Comments

Flow · Accepted Answer · 2022-10-18 22:20:02Z

1

This would be the code:

myList = ["USD", "ERU", "BRL", "JPY", "TRY"]

userInput = input("Enter a currency: ").upper()
while userInput not in myList:
    print("Currency not found")
    userInput = input("Enter a currency: ").upper()

answered Oct 18, 2022 at 22:20

Flow

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2 Comments

flakes Over a year ago

Can save two lines with an assignment expression: while (userInput := input("Enter a currency: ").upper()) not in myList:

Flow Over a year ago

@flakes I do know this is a valid option but it is usually better to not give a one-linear to a beginner.

Mohamed Darwesh · Accepted Answer · 2022-10-18 22:22:45Z

0

myList = ["USD", "ERU", "BRL", "JPY", "TRY"]
while (exchangeCurrency := input("what currency would you like to convert to: ").upper()) not in myList:
    print("Error: currency not found")

answered Oct 18, 2022 at 22:22

Mohamed Darwesh

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Comments

Squid · Accepted Answer · 2022-10-18 22:19:26Z

-1

a simple solution that may work

isTrue = True

while isTrue:
 if exchangeCurrency != myList:
   print("try again. Invalid currency")
 else:
   print("this currency is on the list")
   isTrue = False

answered Oct 18, 2022 at 22:19

Squid

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