Almost every tutorial and SO answer on this topic insists that you should never modify a list while iterating over it, but I can’t see why this is such a bad thing if the code is valid. For example: while len(mylist) > 0: print mylist.pop() Am I missing something? Answers: Thank you for visiting the … Read more
In Python, How can one subtract two non-unique, unordered lists? Say we have a = [0,1,2,1,0] and b = [0, 1, 1] I’d like to do something like c = a - b and have c be [2, 0] or [0, 2] order doesn’t matter to me. This should throw an exception if a does not contain all elements in b.
I want to create a list that can only accept certain types. As such, I’m trying to inherit from a list in Python, and overriding the append() method like so:
I have a list of lists like this:
I am trying to do print all the possible outcomes of a given list and I was wondering how to put a value into various locations in the list. For example, if my list was [A, B], I want to insert X into all possible index of the list such that it would return this [X, A, B], [A, X, B], [A, B, X].
[{'date': '2010-04-01', 'people': 1047, 'hits': 4522}, {'date': '2010-04-03', 'people': 617, 'hits': 2582}, {'date': '2010-04-02', 'people': 736, 'hits': 3277}] Suppose I have this list. How do I sort by “date”, which is an item in the dictionary. But, “date” is a string… Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all … Read more
Safely evaluate an expression node or a Unicode or Latin-1 encoded
string containing a Python expression. The string or node provided may
only consist of the following Python literal structures: strings,
numbers, tuples, lists, dicts, booleans, and None.
I have a list:
What is the best way to create a new empty list in Python?
I have a list of dictionaries, and I need to get a list of the values from a given key from the dictionary (all the dictionaries have those same key).