I want the error message to print after I input the two lists-CodePudding

try:

    list_one = eval(input())
    list_two = eval(input())

    sum = 0
    newlis = []

    for i in range(len(list_one)):
        newlis.append(list_one[i] * list_two[i])

    for i in newlis:
        sum  = i

    print(sum)

except IndexError:
    print("Index out of bound")

except NameError:
    print("The list has some non number values")

If I run this code, it asks to enter two lists one by one. I've put an exception in case any list with any non-integer-element is input. Now if I input this list [1,b,2,4] on the first time, the error immediately shows up. I want this error message after I input both the lists.

CodePudding user response：

You can simply make the following :

try:

    list_one, list_two = input(), input()
    list_one, list_two = eval(list_one), eval(list_two)

    sum = 0
    newlis = []

    for i in range(len(list_one)):
        newlis.append(list_one[i] * list_two[i])

    for i in newlis:
        sum  = i

    print(sum)

except IndexError:
    print("Index out of bound")

except NameError:
    print("The list has some non number values")

But keep in mind that this doesn't prevent passing anything other than numbers, it just prevents passing an element containing a syntax error (like you did in the exemple, as a isn't valid, but "a" is).

So you will have to add an except for TypeError, and change the message for your NameError :

try:

    list_one, list_two = input(), input()
    list_one, list_two = eval(list_one), eval(list_two)

    sum = 0
    newlis = []

    for i in range(len(list_one)):
        newlis.append(list_one[i] * list_two[i])

    for i in newlis:
        sum  = i

    print(sum)

except IndexError:
    print("Index out of bound")

except NameError:
    print("The given object is invalid")

except TypeError:
    print("The object passed isn't a list of numbers")