🔒 Iterate over a list of tuples while keeping an index

[bright fjord]

I have a list of tuples (of two length), and would like to iterate over both value and the index of the tuple in the list.
I have come up with a work around but I'm asking for is there a way to concentrate the defining of those variables into one line of for loop definition?
(or generally make the code look nicer)

example of desired output:

some_list = [(x1,y1),(x2,y2),(x3,y3),(x4,y4),(x5,y5)]
for index, x, y in some_list:
  ...

what I used instead:

some_list = [(x1,y1),(x2,y2),(x3,y3),(x4,y4),(x5,y5)]
for index, xy in enumerate(some_list):
  for x,y in xy:
    ...

[elfin geyser]

@bright fjord

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[full scaffold]

Yes.

Let me just read over you question some more to make sure I understand it correctly.

Okay, so let's take a step back to unpacking and how you can wrangle it.

[bright fjord]

ok

[full scaffold]

!e py a, b, c = 1, 2, 3 print(a) print(b) print(c)

[elfin geyser]

@full scaffold :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | 1
002 | 2
003 | 3

[full scaffold]

Straightforward enough.

[bright fjord]

Yes I understand this.

[full scaffold]

!e py a, (b, c) = (1, (2, 3)) print(a) print(b) print(c)

[elfin geyser]

@full scaffold :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | 1
002 | 2
003 | 3

[full scaffold]

You can also use a structure of variables to match the structure of the thing being unpacked.

So in a for loop situation...

[bright fjord]

so instead of

some_list = [(x1,y1),(x2,y2),(x3,y3),(x4,y4),(x5,y5)]
for index, x, y in some_list:
  ...

i would have

some_list = [(x1,y1),(x2,y2),(x3,y3),(x4,y4),(x5,y5)]
for index, (x, y) in some_list:
  ...

[full scaffold]

!e py data = [(1, (2, 3)), (4, (5, 6)), (7, (8, 9))] for a, (b, c) in data: print(a, b, c)

[elfin geyser]

@full scaffold :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | 1 2 3
002 | 4 5 6
003 | 7 8 9

[full scaffold]

Or, more specifically...

!e py data = [(1, 2), (3, 4), (5, 6)] for indexab in enumerate(data): print(indexab)

[elfin geyser]

@full scaffold :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | (0, (1, 2))
002 | (1, (3, 4))
003 | (2, (5, 6))

[full scaffold]

!e py data = [(1, 2), (3, 4), (5, 6)] for index, (a, b) in enumerate(data): print(index, a, b)

[elfin geyser]

@full scaffold :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | 0 1 2
002 | 1 3 4
003 | 2 5 6

[full scaffold]

The first column being the indexes

The second and third being the a and b values

[bright fjord]

does this change if the items in the list are not tuples instead lists of strings?

[full scaffold]

It works on iterability.

You'll get tuples out of enumerate

once you separate out the index, you're left with the element of the thing you're enumerating over

Which you can unpack how you want

Providing it's iterable

So if it's a list of strings, that'll work, too.

!e py data = [['apple', 'pear', 'orange'], ['banana', 'peach', 'lychee'], ['tomato', 'durian', 'lemon']] for i, (a, b, c) in enumerate(data): print(i, a, b, c)

[elfin geyser]

@full scaffold :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | 0 apple pear orange
002 | 1 banana peach lychee
003 | 2 tomato durian lemon

[full scaffold]

There's a few other ways of unpacking things, too, using starred forms.

!e py a, b, *c = 'abcdefg' print(a) print(b) print(c)

[elfin geyser]

@full scaffold :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | a
002 | b
003 | ['c', 'd', 'e', 'f', 'g']

[full scaffold]

Which can be applied in the for loops, if you need.

[bright fjord]

Ok. So this problem originated from me doing two .split() on a file, resulting in a lists of list of strings.
Was there a easier ways to unpack the data?

the data was in the format:

data, data, data; data, data;data

where the sections are seperated by ';' and individual value are seperated by ','

the intention was to check each data value to some range whilst still keeping the index for the outer-most list as the result

(where the outer most list is separated by new lines in the txt)

[full scaffold]

Using str.split seems like a reasonable approach, provided there aren't any wriggly exceptions to rules, like escape sequences where you might have a literal ; in the data but not want it to act as a separator.

[bright fjord]

the data was nice enough to be in the format i described

does the csv module help me here?

[full scaffold]

It might, but that might just be by accident.

[bright fjord]

I think I'm satisified with this. Thank you for teaching me!

!close

[elfin geyser]

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