Only 5 currencies are to be used in a python currency converter tool––(USD, EUR, CAD, GBP, and CHF). If user inputs a different currency in convertFrom or convertTo, how do I add an error message informing user to try again?
convertFrom = input("What currency would you like to convert from? ")
amount = int(input("How much of that currency would you like to convert? "))
convertTo = input("Which currency would you like to convert to? ")
You could use a list of valid currencies
validCurrencies = ["EUR","GBP","USD","CAD", "CHF"]
Then you can validate the input by
currencyFrom = ""
while not currencyFrom in validCurrencies:
currencyFrom = input("What currency would you like to convert from: (e.g. GBP)").upper()
if not currencyFrom in validCurrencies:
print("Invalid Currency, Please Try again")
print("correct Currency please follow next instructions")
output:
What currency would you like to convert from: (e.g. GBP) uuu
Invalid Currency, Please Try again
What currency would you like to convert from: (e.g. GBP) Gbp
correct Currency please follow next instructions
You can do the same for convertTo and amount
Create a list of currencies that your program supports.
When the user enters a currency, before converting it, check if that currency exists in your list. If it does not, then show an error message. Otherwise, go ahead with the conversion
supported_currencies = ['USD', ...]
convertFrom = input("What currency would you like to convert from? ")
if convertFrom in supported_currencies:
convert()
else:
print("currency not supported")
You can also check for convertTo variable whether it exists in the supported list of currencies or not.
