I’m storing a lot of complex data in tuples/lists, but would prefer to use small wrapper classes to make the data structures easier to understand, e.g. would be preferable over however there seems to be a horrible memory overhead: and Why? is there any obvious alternative solution that I didn’t th…
Tag: list
Iterate over list selecting multiple elements at a time in Python
I have a list, from which I would like to iterate over slices of a certain length, overlapping each other by the largest amount possible, for example: In other words, is there a shorthand for zip(seq, seq[1:], seq[2:]) where you can specify the length of each sub-sequence? Answer [seq[i:i+3] for i in range(le…
How to optimize code for deleting n position in all the lists from a list of lists
I search the site for this issue and I found many posts about deleting specific values from list of lists. However, this doesn’t answer my question. Lets have: Now, in my mind the two lists are linked. List 1 number items: 1, 2, 3, 4,… and list 2 a feature of these items (for example prices: $100,…
create a list of all the subsets of a given list in python 3.x
how can I create a list of all the subsets of a given list in python 3.x? the list given be like [1,2,3] and i want an output like Answer You can use itertools.combinations to get the combinations: combining with list comprehension, you will get what you want:
Why when I extend a list does it have ‘NoneType’ as type?
I am looking to extend a list and have the following This gives ListC as having <type ‘NoneType’> and I am wondering why this isn’t just a list as well. Thanks! Answer extend, like many other list operations, operates in-place and returns None. ListA is modified with the extra elements…
Python/Pandas: If Column has multiple values, convert to single row with multiples values in list
In my DataFrame, I have many instances of same AutoNumber having different KeyValue_String. I would like to convert these instances to a single row where the KeyValue_String is a list comprised of the multiple unique values. The desired output would look like this, except I want to keep all of the other colum…
Checking if a list has duplicate lists
Given a list of lists, I want to make sure that there are no two lists that have the same values and order. For instance with my_list = [[1, 2, 4, 6, 10], [12, 33, 81, 95, 110], [1, 2, 4, 6, 10]] it is supposed to return me the existence of duplicate lists, i.e. [1, 2, 4, 6, 10].
bisect_left on first item of list within list, Python 3
I have a list like this for example: and I need to = bisect_left the first item of each tuple to find an index in the list. However, I can’t think of a way of doing this without creating a list of all of these first items before hand: exampleList = [L[i][0] for i in range(len(L))] any ideas on another
Python asyncio task list generation without executing the function
While working in asyncio, I’m trying to use a list comprehension to build my task list. The basic form of the function is as follows: My goal is to use a list of terms to create my task list: My initial thought was: This doesn’t create the task list it runs the function during the list comprehensi…
How to find the smallest closest number in a list in python
I want to know how can I find the smallest closest number in a list to a given number. For example: I tried this: The output is 25 and not 15. The problem is that it always gives me the “biggest closest” and not the “smallest closest”. Answer You could make the key also contain the num…