使用 while 循环创建函数

Question

How can i add the travel fare into a while loop (error message) that works with many travel fares? I want to create a function using the while loop. like without inserting the error message after each travelFare, i want to create a function to stop myself from repeating. and my using spyder.

travelfare1=float(input("enter travel fare 1:" ))

travelfare2=float(input("enter travel fare 2: "))

travelfare3=float(input("enter travel fare 3: "))

while travelfare1 <5 or travelfare1 >20:

    print("invalid entry")

    travelfare1=float(input("enter travel fare 1:" ))

please help

Answer 1

You could do something like this:

def get_travel_fare(number):
    travelfare = float(input(f"enter travel fare {number}:" ))
    while travelfare < 5 or travelfare > 20:

        print("invalid entry")

        travelfare = float(input(f"enter travel fare {number}:" ))
    return travelfare


travelfare1 = get_travel_fare(1)
travelfare2 = get_travel_fare(2)
travelfare3 = get_travel_fare(3)

Answer 2

try this out:

def get_fare(mini, maxi):
    fare = float(input("travel fare please: "))
    while fare not in range(mini, maxi+1):
        print("invalid value, please enter a new one") 
        fare = float(input("travel fare please: "))
    return fare

travel_fares = [get_fare(5,20), get_fare(5,20), get_fare(5,20)] # list of the functions (which will make a list of the return values after they're run)

print(f"average: {sum(travel_fares)/len(travel_fares)}") # sum of elements in list divided by length of list (amount of items)

when entering: 15 , 10 and 5 :

travel fare please: 5
travel fare please: 10
travel fare please: 15
average: 10