How do I hash a built-in node in deque (which is a double linked list) and delete the node in the middle in O(1)? Is the built-in node exposed? For example, I want to save a deque’s node in dict so I can delete the node in constant time later. This is a use case in LRU, using deque so
Tag: python
Expand a dict containing list items into a list of dict pairs
If I have a dictionary containing lists in one or more of its values: How can I get a list of dict tuples paired by pair and iterating over c, with all else remaining constant? E.g. Answer Well, this doesn’t feel especially elegant, but you might use a nested for loop or list comprehension: or A cleaner…
Interpreting logistic regression feature coefficient values in sklearn
I have fit a logistic regression model to my data. Imagine, I have four features: 1) which condition the participant received, 2) whether the participant had any prior knowledge/background about the phenomenon tested (binary response in post-experimental questionnaire), 3) time spent on the experimental task,…
pivot_table requires more memory if dtype is category (MemoryError)
I have the following strange error with pandas(pandas==0.23.1) : I am wondering if this is expected and I am doing something wrong, or if this is a bug in pandas. Should dtype category for str not be very transparent (for this use case)? Answer This is not a bug. What’s happening is pandas.pivot_table i…
Protocol error, got “H” as reply type byte
I am trying to use django channels for the first time and i am following the tutorial in the documentation. But when I use python manage.py runserver and try to connect i get this error. Here is the whole console(I’m using anaconda): On the frontend js return this error Here is the whole “pip free…
Enabling console features with code.interact
If I start a new Python interactive session from the command line, some console features such as using the arrow keys to access a previous command, etc. are present. If instead, however, I use code.interact() to start an interactive session from inside a larger script, the escape sequences aren’t proper…
Error “pip install boto3”
Answer Upgade pip as follows: curl https://bootstrap.pypa.io/get-pip.py | python It can be usefull for you, maybe you have to execute sudo python
VTK rendering 2D mesh in python
so i’m trying to render a 2D mesh using vtk (in python). I have a list of tuples containing all the points and also a list of tuples containing the points of each cell. Just to experiment, I tried to create a polydata object of a square with 4 elements and render it, but i ended up with this: I
Removing case sensitivity from Email in Django login form
I’ve created a custom UserModel and used Email as main authenticating id instead of username. The problem that it is case sensitive, as it counts test@gmail.com,Test@gmail.com as 2 different accounts. I need to force it to deal with both as 1 account ignoring if it upper or lower case. Here are my files…
GridSearchCV.best_score not same as cross_val_score(GridSearchCV.best_estimator_)
Consider the following gridsearch : grid = GridSearchCV(clf, parameters, n_jobs =-1, iid=True, cv =5) grid_fit = grid.fit(X_train1, y_train1) According to Sklearn’s ressource, grid_fit.best_score_ returns The mean cross-validated score of the best_estimator . To me that would mean that the average of : …