How do I serialize a many-to-many field into list of something, and return them through rest framework? In my example below, I try to return the post together with a list of tags associated with it. models.py serializers.py views.py Answer You will need a TagSerializer, whose class Meta has model = Tag. After…
Tag: python
How to create groupby subplots in Pandas?
I’ve got a dataframe with timeseries data of crime with a facet on offence (which looks like the format below). What I’d like to perform a groupby plot on the dataframe so that it’s possible to explore trends in crime over time. I’ve got some code which does the job, but it’s a b…
Python regex iteration for all combinations
I am new to regex. I am using Python 2.7 and BeautifulSoup4. I want to iterate over a particular regular expression. Required ouput : length : 5 , expression : [a-zA-Z0-9!&#%@] It should try all possible combinations e.g: [‘aaaaa’,’aaaab’,’aaaac’,…,’aaaaz…
How to set class attribute with await in __init__
How can I define a class with await in the constructor or class body? For example what I want: or example with class body attribute: My solution (But I would like to see a more elegant way) Answer Most magic methods aren’t designed to work with async def/await – in general, you should only be usin…
Convert PIL Image to byte array?
I have an image in PIL Image format. I need to convert it to byte array. Now I need the roiImg as a byte array. Answer Thanks everyone for your help. Finally got it resolved!! With this i don’t have to save the cropped image in my hard disc and I’m able to retrieve the byte array from a PIL
how to use word_tokenize in data frame
I have recently started using the nltk module for text analysis. I am stuck at a point. I want to use word_tokenize on a dataframe, so as to obtain all the words used in a particular row of the dataframe. Basically, i want to separate all the words and find the length of each text in the dataframe. I know
Being able to change the settings while running scrapy from a script
I want to run scrapy from a single script and I want to get all settings from settings.py but I would like to be able to change some of them: I wasn’t able to use this. I tried the following: but it didn’t work. Note: I’m using the latest version of scrapy. Answer So in order to override som…
Fetch connected nodes in a NetworkX graph
Straightforward question: I would like to retrieve all the nodes connected to a given node within a NetworkX graph in order to create a subgraph. In the example shown below, I just want to extract all the nodes inside the circle, given the name of one of any one of them. I’ve tried the following recursi…
Adding Multiple Values to Single Key in Python Dictionary Comprehension
I wanted to learn how to use dictionary comprehension and decided to use one for the previously solved task. I need to assign multiple values to the same key. I was wondering if there’s a better way to achieve what I’m trying to do than with the code I’ve written so far. For example I have t…
Not able to parse a .csv file uploaded using Flask
I am trying to upload a CSV file, work on it to produce results, and write back (download) a new CSV file containing the result. I am very new to Flask and I am not able to get a “proper” csv.reader object to iterate and work upon. Here is the code so far, The terminal output being Whereas the fil…