Timeline for iterating over the values of a list of ordered dictionaries
Current License: CC BY-SA 3.0
13 events
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| Dec 20, 2015 at 20:42 | history | edited | Barry | CC BY-SA 3.0 |
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| Dec 20, 2015 at 20:28 | comment | added | martineau |
It should be noted that the yield from <expression> form wasn't added until Python 3.3 according to the documentation.
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| Dec 20, 2015 at 20:22 | comment | added | BenC |
You could also use .values() instead of .items() to avoid the need for _ -- really just up to you.
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| Dec 20, 2015 at 20:08 | vote | accept | aaragon | ||
| Dec 20, 2015 at 19:58 | history | edited | Barry | CC BY-SA 3.0 |
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| Dec 20, 2015 at 19:58 | comment | added | Barry |
@aaragon _ is for things you don't care about - just name them _ to indicate that they won't be used again. No idea why you would need __call__. Just look up what yield means and how it can be used.
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| Dec 20, 2015 at 19:56 | comment | added | aaragon |
Ok I see. Now, I'm new to Python so this code seems quite complex. I don't understand the _ in the for loops. Also, this generator that is returned is iterating over the whatever dictionary, but in my data structure I have a list of whatever dictionaries. So if I want to go to a lower dimension, then that means I have to change the whatever dictionary. Should I store a variable to determine this and override __call__ to change this variable as I've done it above?
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| Dec 20, 2015 at 19:54 | comment | added | Barry |
@aaragon Yep. __iter__ can return a generator.
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| Dec 20, 2015 at 19:53 | comment | added | aaragon |
I think I like this last suggestion but I'm not sure I understand exactly how to do that. I create a class, say Custom, and I override the __iter__ method and put inside what you wrote. That's it?
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| Dec 20, 2015 at 19:51 | history | edited | Barry | CC BY-SA 3.0 |
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| Dec 20, 2015 at 19:50 | comment | added | Barry |
@aaragon You have for c in iter_over_custom(custom). Or you can make custom its own class and define __iter__ as what I wrote iter_over_custom to be (__iter__ can yield).
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| Dec 20, 2015 at 19:47 | comment | added | aaragon |
But using this approach I still don't have the for c in custom: syntax, do I? Nor I can't iterate over lower-dimensional dictionaries?
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| Dec 20, 2015 at 19:45 | history | answered | Barry | CC BY-SA 3.0 |