The PEP, titled Additional Unpacking Generalizations, generally reduced some syntactic restrictions when using the starred * expression in Python; with it, joining two lists (applies to any iterable) can now also be done with:

@Full Decent, thanks for point this out, did not think about that i=n case. But I think if it is i=n case, can loop in the lists and concatenate them. For me, just need the most comma way to join 2 lists without duplication elements. –

merge two lists python. 0. Python: How to merge two lists into one ... How to combine elements in two ...

Apr 4, 2009 · I used Python's map function to produce a tuple of element and it's count and groupby over the array. Note that the groupby takes the array element itself as the keyfunc. As a relatively new Python coder, I find it to me more easier to comprehend, while being Pythonic as well. Before I discuss the code, here is a sample of data I had to flatten ...

Jun 11, 2013 · What is the fastest way to achieve the following in python? list = [1,2,3,4,5,6,7,8] Please note that there can be many ways to merge two lists in python. I am looking for the most time-efficient way. I tried the following and here is my understanding. CODE

I think, this answer should get more credit. If one has variable number of lists. Let's say in data preparation you have positives and negatives (user can define the number of negatives), then the above solution will solve this issue with variable number of negatives list.

Apr 25, 2017 · Python: Combining two lists to make a new list. 0. How to combine two lists in a single list with ...

Use zip: >>> t1 = ["abc","def","ghi"] >>> t2 = [1,2,3] >>> list(zip(t1,t2)) [('abc', 1), ('def', 2), ('ghi', 3)] # Python 2 you do not need 'list' around 'zip'

Oct 24, 2013 · One possible way to define it: lst1 + [x for x in lst2 if x not in lst1] Out[24]: [{'id': 1, 'x': 'one'}, {'id': 2, 'x': 'two'}, {'id': 3, 'x': 'three'}]

Jan 18, 2014 · If you've only got two sequences to "multiply" like this, and your iteration is dead-simple, a nested loop in a comprehension is perfectly readable: ['{}{}'.format(a, b) for a in first for b in second]