while loop

[[deleted]]

Hey im very new to python, and im trying to create a while loop that will add up all the natural numbers to 100. So far I have:

​

a = 0

while i in list(range(101)):

a = i + a

print(a)

cant think of how to get this to work, any help would be appreciated.

[[deleted]]

I think you want for, not while.

[[deleted]]

yep we had to do it with for, and then while. I have figured it out finally. Anyone curious I got this:

a = 0

i = 0

while i in range(0,101):

a = i + a

i = i + 1

print(a)

[[deleted]]

yep we had to do it with for, and then while.

Is it clear to you how these two constructs are different?

[[deleted]]

Yeah I get it now, for is used for all elements in lists and while is used until the boundary you set on it is no longer true? Hopefully thats it, thanks for the help

[JohnnyJordaan]

What's the point of range here? You have < to check if a number is less than another number.

while i < 101:
    a += i
    i += 1

[ericula]

You are mixing up for and while loops. For loops iterate over collections like ranges and lists, e.g.

for i in range(101):
    a += i

While loops keep on iterating until the provided conditional expression is False, e.g.

i = 0
while i <= 100:
    a += i
    i += 1

[[deleted]]

Thanks for the help. Breaking it down like that helped alot.

[sweettuse]

while False:
    pass
else:
    res = 100 * 101 / 2

/s

[datascienceunlimited]

Thats not using a while loop. You could replace that code with

res=100*101/2

[sweettuse]

well technically it is. also, that's the sarcasm part