pytutorial/python_basics/for

Flow Control for-loop

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* TOC {:toc}

The goal

For what reason...

Questions to David Rotermund

Logic blocks need to be indented.​ Preferable with 4 spaces!

The for statement

The for statement is used to iterate over the elements of a sequence (such as a string, tuple or list) or other iterable object

With range()

for i in range(0, 3):​
    print(i)​

Output:

0​
1​
2

range()

class range(stop)
class range(start, stop[, step])

With a list

for i in [0, "A", 7, "nom num"]:​
    print(i)

Output:

0​
A​
7​
nom num​

The full statement

for_stmt ::=  "for" target_list "in" starred_list ":" suite
              ["else" ":" suite]

for loop (enumerate)​

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for loop (the truth)​

{: .topic-optional} This is an optional topic!

The for loop is not counting up itself. It uses the __iter__ & __next__ combo of a instance of a class or a generator via yield.

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