map() and filter() are good when it comes to applying a function individual elements, but there is no way to do any of the following with them on iterables : apply functions on a bunch of elements as a whole keep track of previously iterated elements / ‘accumulate’ items get the index of the curre…
Tag: python
Python 3.10 read from playlist file, wrong first character of first line
File: main_nested.aimppl File: read_playlist_file.py Output: Expected output: As you can see in the first line there is no # print. This file was created from python3.10. Maybe you can’t reproduce this problem. Maybe it’s a utf-bom character issue. This code works: What’s the problem with th…
New rows based on a string – Pandas. python
I have this pandas df I need to be able to break down the ‘cast” field in such a way that it is in several rows Example: I understand that I should do it with pandas, but it is very complicated, can you help me? Answer You can use spit and explode:
How to get NumPy array of n last/first Trues in each row
I have a broadcasted array, which is sorted rowly, and a masked array. I want to get the last n elements (or the first n ones) of each row which are True i.e.: Do we have to split the array (using np.cumsum(np.sum(mask, axis=1))), pad and …? What will be the best way to do this just with NumPy? Answer Using
Sort in nested dict by summing values python pandas
I have nested dict something like that I need sort on the level “code” with depending on summing values “brands”. For example, *# ‘code2.2’ first because 2+1+25=28 > 2+8+5+4=19 # ‘code3’ first because 1+2=3 > 2 I can sum values “brands” by R…
Iterating through a column and mapping values
Here is what I am trying to do. I want to substitute the values of this data frame. For example. Bernard to be substituted as 1, and then Drake as 2 and so on and so forth. How to iterate through the column to write a function that can do the following. Answer The function already exists – pd.factorize.…
SHAP Linear model waterfall with KernelExplainer and LinearExplainer
I am working on binary classification and trying to explain my model using SHAP framework. I am using logistic regression algorithm. I would like to explain this model using both KernelExplainer and LinearExplainer. So, I tried the below code from SO here This threw an error as shown below AssertionError: Unk…
UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0xc4 in position 1: ordinal not in range(128)
So, as title of the questions says, I have a problem with encoding/decoding of strings. I am using: python 2.7 | django 1.11 | jinja2 2.8 Basically, I am retrieving some data from data base, I serialize it, set cache on it, then get the cache, deserialize it and rendering it to the template. Problem: I have f…
Interrupt (NOT prevent from starting) screensaver
I am trying to programmatically interrupt the screensaver by moving the cursor like this: And it fails with the message: This error only occurs if the screensaver is actively running. The reason for this request is that the computer is ONLY used for inputting data through a bluetooth device (via a Python prog…
Python Mongo docker-compose Topology Error
I’m trying really simple example of mongo with python and got an error. Dockerfile: run_test.sh docker-compose.yaml: db_test.py: db.py: I’m doing docker-compose up and got this output: So it looks like it can’t connect to the database. I didn’t change ports or something, and another ex…