range()
range() is a special function that generates range of numbers. range() has three parameters:
range(start, end, step) - returns the numbers starting from start up to end (exclusive) with the step step.
Examples
range(1, 10, 1): returns (1, 2, 3, 4, 5, 6, 7, 8, 9).
range(-3, 4, 3): returns (-3, 0, 3).
range(22, 22, 1): returns empty range.
You can also use such a range() functions:
range(end): the shorter version ofrange(0, end, 1)range(start, end): the shorter version ofrange(start, end, 1).
Run the following examples to see the loop iteration.
12345678for i in range(8): print(i) for i in range(7, -1, -1): print(i) for i in range(1, 11, 2): print(i)
Using range() in for loop condition helps to specify the start and end conditions, however set a step. By the way, variable that stores the value (here is an i) shouldn't be defined before the loop. It exists only inside the loop.
Negative step
What happens if pass negative value of step? Actually, still the same: generates range of numbers starting with start decreasing down to end (still exclusive). The code to generate odd numbers between 8 and 20 in descending order:
12for i in range(20, 8, -2): print(i)
Swipe to start coding
Output the list in reverse order using for loop and range(): iterate from the last symbol to the first one. Output each symbol separately on each line.
Soluzione
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range() is a special function that generates range of numbers. range() has three parameters:
range(start, end, step) - returns the numbers starting from start up to end (exclusive) with the step step.
Examples
range(1, 10, 1): returns (1, 2, 3, 4, 5, 6, 7, 8, 9).
range(-3, 4, 3): returns (-3, 0, 3).
range(22, 22, 1): returns empty range.
You can also use such a range() functions:
range(end): the shorter version ofrange(0, end, 1)range(start, end): the shorter version ofrange(start, end, 1).
Run the following examples to see the loop iteration.
12345678for i in range(8): print(i) for i in range(7, -1, -1): print(i) for i in range(1, 11, 2): print(i)
Using range() in for loop condition helps to specify the start and end conditions, however set a step. By the way, variable that stores the value (here is an i) shouldn't be defined before the loop. It exists only inside the loop.
Negative step
What happens if pass negative value of step? Actually, still the same: generates range of numbers starting with start decreasing down to end (still exclusive). The code to generate odd numbers between 8 and 20 in descending order:
12for i in range(20, 8, -2): print(i)
Swipe to start coding
Output the list in reverse order using for loop and range(): iterate from the last symbol to the first one. Output each symbol separately on each line.
Soluzione
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