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[bright copper]

What if for lopp

[supple radish]

@bright copper

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[bright copper]

What is for loop

[umbral helm]

Have you covered the concept of assignment?

[bright copper]

Yes

[umbral helm]

var = ...

Okay, great.

Do you have a decent concept of what a sequence is?

For example, the string, 'abc' is a sequence of three characters, the strings 'a', 'b' and 'c', right?

[bright copper]

Yes

[umbral helm]

Or the list ['apple', 'pear', 'orange']

That's a sequence of length 3

A for loop is a repeated assignment operation, assigning a variable or structure of variables to each element of a sequence.

I will demonstrate.

!e py for letter in 'abc': print(letter)

[supple radish]

@umbral helm :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | a
002 | b
003 | c

[umbral helm]

This is similar to...

letter = 'a'
print(letter)
letter = 'b'
print(letter)
letter = 'c'
print(letter)```

It's taking the variable, letter, and pointing it at each element of the iterable, here the string, that I feed to the for loop.

!e py for fruit in ['apple', 'pear', 'orange']: print(fruit)

[supple radish]

@umbral helm :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | apple
002 | pear
003 | orange

[umbral helm]

fruit = 'apple'
print(fruit)
fruit = 'pear'
print(fruit)
fruit = 'orange'
print(fruit)```

Some object types are iterable. Others are not.

!e py for number in 123: print(number)

[supple radish]

@umbral helm :x: Your 3.12 eval job has completed with return code 1.

001 | Traceback (most recent call last):
002 |   File "/home/main.py", line 1, in <module>
003 |     for number in 123:
004 | TypeError: 'int' object is not iterable

[umbral helm]

Integer objects are not iterable.

Sets, dicts, tuples, lists, strings are iterable.

Many objects are iterable, the only requirement is that their class implements the __iter__ special method, but you probably don't need to worry about that just now.

Many objects are not iterable.

It comes down to what type of object they are.

Sometimes, you'll want to iterate over a range instance.

!e py for i in range(3): print(i)

[supple radish]

@umbral helm :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | 0
002 | 1
003 | 2

[umbral helm]

!e py for _ in range(3): print('Hello, world.')Sometimes you'll want to use this simply to do something a given number of times.

[supple radish]

@umbral helm :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | Hello, world.
002 | Hello, world.
003 | Hello, world.

[umbral helm]

@bright copper Any questions?

Making sense?

I'm leaving now. Feel free to ask any questions before your post expires and I'll check back in later.

[supple radish]

Python help channel closed

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