Python Python Sequences Sequence Iteration Iterating over Ranges

Timothy Maycock
PLUS
Timothy Maycock
Courses Plus Student 3,346 Points

Why "NONE"

My code passes the check yet when I run it through VSC it returns NONE as the values. Tried googling it to understand why this happens but couldn't get a good answer. Any help in understanding this would be greatly appreciated.

Cheers

iterating_ranges.py
my_list = []

for i in range(10):
    print(my_list.append(i))

1 Answer

Jennifer Nordell
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STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi there, Timothy Maycock! The code challenge itself doesn't ask you to print anything. What you're doing here, is printing the result of the .append method. That method adds an item to a list, but it has a return type of None.

But if you modified what and where you are printing, then your results would be wildly different.

Try this:

my_list = []

for i in range(10):
    my_list.append(i)

print(my_list)

Hope this helps! :sparkles:

Timothy Maycock
Timothy Maycock
Courses Plus Student 3,346 Points

Hi Jennifer

Ok. With your explanation and code snippet I see where I went wrong. Happy I asked as when I clicked the check work button, it gave me a passing result, even though my code was the wrong solution.

Thanks for clarifying it for me

Cheers