Common Questions - sopython

This is a list of common questions within the Python tag. Each question includes some canonical SO questions that can be used to close-vote any new questions that match. If you have any suggestions then please come see us in chat.

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Accessing current and next item during iteration iteration list Sometimes it is useful to access both the current and next item when iterating over a list.
For loop contains an unconditional return return for-loop newbie The asker is surprised that their `for` loop containing a `return` statement exits after one iteration
How do I unpack the contents of an iterable into separate variables? unpacking assignment Unpacking assignment from a list, tuple, map, etc. into separate names
Indentation problems caused by using tabs, with the tab size in the editor configured to 4 spaces. indentation tabs Python 2 and 3 allow tabs to be used to indent lines. Python 2 will expand these to a multiple of 8, in Python 3 a tab can be equal only to another tab;, but many editors and Stack Overflow expand tabs to multiples of 4 instead. This can lead to subtle and weird flow errors.
Iterating over a list and indexing with the result leads to TypeError index list iterate `TypeError: list indices must be integers or slices, not ...`
Iterating over pairs of consecutive items in a list
Iterating over two (or more) sequences in parallel iteration zip Zip can be used to iterate over multiple lists at the same time. In Python 3.x a generator is used whilst in Python 2.x a new list of tuples is created, as such itertools.izip may be a better choice.
Modifying a dictionary while iterating over it iteration dict Python throws an error if you modify the `dict` you are currently iterating over. The obvious workaround is to copy the keys to a separate list, or collecting the keys to change into a separate list and modifying them separately after the loop.
Removing items from a list while iterating over the list remove iteration list How to remove items from a list while iterating over the same list without skipping elements.
Single column query results in a list of tuples in SQLAlchemy sqlalchemy tuple The result set of a single column query is a list of tuples, instead of a list of values.
Sorting / comparing version strings sort version Sorting a list of version strings, eg `["1.1.2", "1.0.0", "1.3.3", "1.0.12", "1.0.2"]`, into natural order.
Splitting a list into even chunks. chunk split list How to split a single list into multiple lists with a fixed (maximum) size?
Using an iterable to pass multiple arguments to a function. arguments function splat The splat operator (*) can be used to unpack variables from a container when calling a function.

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