How to concatenate element-wise two lists in Python
I have two lists and I want to concatenate them element-wise. One of the list is subjected to string-formatting before concatenation.
list
Using an index to get an item
I have a list in python (‘A’,’B’,’C’,’D’,’E’), how do I get which item is under a particular index number?
Slicing a list into n nearly-equal-length partitions
I’m looking for a fast, clean, pythonic way to divide a list into exactly n nearly-equal partitions. partition([1,2,3,4,5],5)->[[1],[2],[3],[4],[5]] partition([1,2,3,4,5],2)->[[1,2],[3,4,5]] (or [[1,2,3],[4,5]]) partition([1,2,3,4,5],3)->[[1,2],[3,4],[5]] (there are other ways to slice this one too) There are several answers in here Iteration over list slices that run very close to what I want, except they are focused on the … Read more
join two lists of dictionaries on a single key
Given n lists with m dictionaries as their elements, I would like to produce a new list, with a joined set of dictionaries. Each dictionary is guaranteed to have a key called “index”, but could have an arbitrary set of keys beyond that. The non-index keys will never overlap across lists. For example, imagine the following two lists:
Check if an item is in a nested list
in a simple list following check is trivial:
Joining pairs of elements of a list
I know that a list can be joined to make one long string as in: x = ['a', 'b', 'c', 'd'] print ''.join(x) Obviously this would output: 'abcd' However, what I am trying to do is simply join the first and second strings in the list, then join the third and fourth and so on. … Read more
Tuple unpacking order changes values assigned
I think the two are identical.
What is the inverse function of zip in python?
Possible Duplicate:
A Transpose/Unzip Function in Python
In Python, why is list[] automatically global?
This is a weird behavior.
How to check if an object is a list or tuple (but not string)?
This is what I normally do in order to ascertain that the input is a list/tuple – but not a str. Because many times I stumbled upon bugs where a function passes a str object by mistake, and the target function does for x in lst assuming that lst is actually a list or tuple.