Question

for j in range(2):
for i in range(0, 2, 1):
print(i)


0
1
0
1

0
2

0
1
0
1
0
1

1
2
1
2
1
2

Answer 1

What you pasted are a few examples of nested (and single) for-loops and their outputs. Key points:

- range(start, stop, step) generates integers from start up to but not including stop. If you call range(stop) it’s the same as range(0, stop, 1).
- In a nested loop, the inner loop runs to completion once for every single iteration of the outer loop. That’s why the same inner sequence repeats.

Mapping your examples to code:

1) Your first snippet
for j in range(2):
for i in range(0, 2, 1):
print(i)

Produces:
0
1
0
1

Explanation: outer loop runs twice (j = 0 then 1). Each time the inner loop prints 0 then 1, so 0 1 repeated twice.

2) The output
0
2
is produced by e.g.
for i in range(0, 3, 2):
print(i)

Explanation: range(0,3,2) yields 0, 2.

3) The output
0
1
0
1
0
1
is produced by e.g.
for j in range(3):
for i in range(2):
print(i)

Explanation: outer loop runs 3 times; inner loop prints 0,1 each time → 0,1 repeated 3 times.

4) The output
1
2
1
2
1
2
is produced by e.g.
for j in range(3):
for i in range(1, 3):
print(i)

Explanation: inner loop yields 1,2 and that sequence repeats for each of the 3 outer iterations.

If you want different formatting (print values on one line, or show j with i, or collect outputs to a list), tell me how you want it and I’ll show the code.