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Learn for loop (1/5) | Loops
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for loop (1/5)

Often we don't need to iterate until something happens - we want to iterate over some set of elements, or something like that.

To construct loop iterating over elements use for loop:

12
for var in smth_iterable: do_smth
copy

Common practice is using range() as an iterable object we will use in the loop.
range(n) function with 1 positive argument generates a numbers from 0 to n (exclusive, i.e. to n-1).
range(m,n) function generates number from m to n exclusive in case if both are positive and m < n.

For example, we can rewrite the example from section 5.1 using for loop (in that exercise we printed numbers from 1 to 9)

123
# using for loop to print numbers from 1 to 9 for i in range(1,10): print(i)
copy

Please note, that unlike while loop, variable i inside for loop shouldn't be defined before. It's like a dummy variable.

Task

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Using for loop print all the numbers from 10 to 20 squared.

Solution

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SectionΒ 6. ChapterΒ 3
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book
for loop (1/5)

Often we don't need to iterate until something happens - we want to iterate over some set of elements, or something like that.

To construct loop iterating over elements use for loop:

12
for var in smth_iterable: do_smth
copy

Common practice is using range() as an iterable object we will use in the loop.
range(n) function with 1 positive argument generates a numbers from 0 to n (exclusive, i.e. to n-1).
range(m,n) function generates number from m to n exclusive in case if both are positive and m < n.

For example, we can rewrite the example from section 5.1 using for loop (in that exercise we printed numbers from 1 to 9)

123
# using for loop to print numbers from 1 to 9 for i in range(1,10): print(i)
copy

Please note, that unlike while loop, variable i inside for loop shouldn't be defined before. It's like a dummy variable.

Task

Swipe to start coding

Using for loop print all the numbers from 10 to 20 squared.

Solution

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

close

Awesome!

Completion rate improved to 2.33

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