range

Makes a sequence of whole numbers, most often for a for loop.

Synopsis

range(stop)
range(start, stop)
range(start, stop, step)

range(3) gives 0, 1 and 2. It starts at 0 and stops before stop.

for i in range(n): is how Python repeats something n times, like Scratch's repeat block.

Name	Meaning
`start`	The first number. The default is 0.
`stop`	The number to stop before. It is not included.
`step`	How much to add each time. The default is 1. It can be negative.

A range. Wrap it in list(...) to see all the numbers at once.

for i in range(3):
    print(i)
print(list(range(1, 4)))
print(list(range(10, 0, -3)))

It prints:

0
1
2
[1, 2, 3]
[10, 7, 4, 1]

for i in range(1, 3):
    print(i)

It prints:

1
2

Only 1 and 2. stop is never included, so to count 1 to 3 write range(1, 4).