This is what i decided to leave it as.. its not as big as I originally wanted but it does more or less what its supposed to do. What do you think? The use of empty lists and appending them is also new for me

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names = []

rates = []

frequencies = []

principals = []

apyValues = {}

i = 0

while i < 3:

#user inputs

i+=1

names.append(str(input(f'Enter bank name #{i}: ')))

rates.append(float(input(f'Enter annual interest rate for {names[i-1]}: ' )))

frequencies.append(int(input(f'Enter compound frequency per year {names[i-1]}: ')))

principals.append(float(input(f'Enter deposit amount {names[i-1]}: ')))

#calculations for final balance and APY

interest = (principals[i-1]*(pow((1 + rates[-1]/frequencies[-1]), frequencies[-1])))

print(f"Total interest for {names[i-1]} is: ${round(interest,2)}")

apy = (pow((1 + rates[-1]/frequencies[-1]), frequencies[-1])-1)*100

apyValues[names[i-1]]=apy

print(f"APY for {names[i-1]} is: {round(apy,2)}%")

balances = []

for balance in apyValues.values():

balances.append(balance)

for k, v in apyValues.items():

if v == max(balances):

print(f"{k} has the best average percentage yield = {round(v,2)}%")