Permutations between two lists of unequal length
I’m having trouble wrapping my head around a algorithm I’m try to implement. I have two lists and want to take particular combinations from the two lists.
list
Create an empty list in Python with certain size
I want to create an empty list (or whatever is the best way) that can hold 10 elements.
Are lists thread-safe?
I notice that it is often suggested to use queues with multiple threads, instead of lists and .pop(). Is this because lists are not thread-safe, or for some other reason?
Why can’t I use a list as a dict key in python?
I’m a bit confused about what can/can’t be used as a key for a python dict.
Access multiple elements of list knowing their index
I need to choose some elements from the given list, knowing their index. Let say I would like to create a new list, which contains element with index 1, 2, 5, from given list [-2, 1, 5, 3, 8, 5, 6]. What I did is:
Different behaviour for list.__iadd__ and list.__add__
consider the following code:
How slow is Python’s string concatenation vs. str.join?
As a result of the comments in my answer on this thread, I wanted to know what the speed difference is between the += operator and ''.join()
Is there a simple way to delete a list element by value?
I want to remove a value from a list if it exists in the list (which it may not).
Why does this code for initializing a list of lists apparently link the lists together?
I intend to initialize a list of list with length of n. x = [[]] * n However, this somehow links the lists together. >>> x = [[]] * 3 >>> x[1].append(0) >>> x [[0], [0], [0]] I expect to have something like: [[], [0], []] Any ideas? Answers: Thank you for visiting the Q&A … Read more
Python List vs. Array – when to use?
If you are creating a 1d array, you can implement it as a List, or else use the ‘array’ module in the standard library. I have always used Lists for 1d arrays.