Indentation within a for loop

Question

this question is based on this other one: Nested Loop Python

One of the answer is

for i in range(1, 10):
    for j in range(i):
        print(i, end='')
    print()

I don't understand why after the print(i, end = ' ') statement Python then runs the print() statement. In other words, since print() is not in the nested loop, shouldn't this code be only run after the nested j loop is completed?

Well yes... it does only run after the nested j loop is completed. Where's the issue? — TerryA, Mar 09 '18 at 21:48
Did you run this code to see what happens? Did you change the indentation to see what happens then? — Jongware, Mar 09 '18 at 21:51
The `print()` is there to print a newline each time after the inner loop is done. — 001, Mar 09 '18 at 21:51
I think it is so it prints one nested loop and then prints an empty line — Crawley, Mar 09 '18 at 21:52
What makes you think that the `print()` statement _doesn't_ only run after the `j` loop? — Aran-Fey, Mar 09 '18 at 21:54
@Crawley: then you think wrong. Why would it print an empty line? It just ends the current line. — Jongware, Mar 09 '18 at 23:51

score 0 · Accepted Answer · answered Mar 09 '18 at 21:54

It is only run after the nested loop. Looking at the output from the post you referenced, the program starts with 1, prints one 1 without a newline, then exits the nested loop, then prints the newline. Then it enters the nested loop with 2, loops twice (prints a 2 without a newline, then prints a second two without a newline), then exits the loop and prints a newline.

score 0 · Answer 2 · answered Mar 09 '18 at 21:54

0

The print() is indented to be a part of the' i' for loop. So every time that 'i' for block runs, the' j 'for happens THEN the print() takes the cursor to the next line

answered Mar 09 '18 at 21:54

uhexos

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score 0 · Answer 3 · answered Mar 09 '18 at 22:03

The print() statement is executed after the nested j loop. It has been indented to make it a part of the outer loop i.

Indentation within a for loop

3 Answers3