list index out of range in simple Python script

Question

I just started learning Python and want to create a simple script that will read integer numbers from user input and print their sum.

The code that I wrote is

Answer 1

If you were going to index the list object you would do:

for i in range(len(inflow)):
    result += inflow[i]

However, you are already mapping int and turning the map object into a list so thus you can just iterate over it and add up its elements:

for i in inflow:
    result += i

As to your second question, since you arent doing any type testing upon cast (i.e. what happens if a user supplies 3.14159; in that case int() on a str that represents a float throws a ValueError), you can wrap it all up like so:

inflow = [int(x) for x in input().split(' ')] # input() returns `str` so just cast `int`
result = 1
for i in inflow:
    result += i
print(result)

To be safe and ensure inputs are valid, I'd add a function to test type casting before building the list with the aforementioned list comprehension:

def typ(x):
    try:
        int(x)
        return True  # cast worked
    except ValueError:
        return False  # invalid cast

inflow = [x for x in input().split(' ') in typ(x)] 
result = 1
for i in inflow:
    result += i
print(result)

So if a user supplies '1 2 3 4.5 5 6.3 7', inflow = [1, 2, 3, 5, 7].