Am new to Django (and Python) and have a problem initializing my model. For every school year created in the database, I want the corresponding days (not exactly 365/366, but > 300) to be created with a default value of 0 (a one-to-many relationship). I learned that I should not try to do this in a constru…
Tag: python
Why no colon in forming a list from loop in one line in Python?
From this website, there is a way to form a list in Python from loop in one line My question is, typically, after a loop, there is a colon, e.g., why in the one-line approach, there is no colon? Is there any underlying reason than convention? Answer Note (in addition to what have been said in comments: it is …
Dash RangeSlider automatically rounds marks
I am using the RangeSlider in Python Dash. This slider is supposed to allow users to select a range of dates to display, somewhere between the minimum and maximum years in the dataset. The issue that I am having is that each mark shows as 2k due to it being automatically rounded. The years range between 1784 …
Dataframe – for each row, compare values of two columns, get value of third column on match
I have a pandas dataframe in Python that contains a list of different stocks by ticker symbol, and for each one, it also records current price and a low and high price alert threshold value. Below shows a sample of the dataframe: TICKER CURRENT PRICE($) ALERT PRICE HIGH ($) ALERT PRICE LOW ($) AMZN 114 180 10…
Cant get logging element
When i was testing my program, it’s end with code 1 here is full error (“Traceback (most recent call last): File “C:Usersds072PycharmProjectspythonProjectmain.py”, line 20, in <module> wait.until(EC.element_to_be_clickable((By.XPATH, “/html/body/main/div/div/div/div[1]/div[…
Column as a sum of its cumulative value only if other column meets condition
I am struggling to produce below df[‘res’] without loop / within pandas. Loop implementation of df[‘res’] In pandas, it could be something like The issue is that df[‘res’] is previously empty. Any hint how to think about these decompositions? Answer As per your requirement,…
Pandas Set Index Based On Column Value
I’m new to pandas, I have a Dataframe read from excel file, like this screenshot below where Products is the header and Google and Meta is the group (index) Using pandas I would like the dataframe to be like this Thank You Answer Using pd.assign and np.where
How to calculate cumulative subtraction with a threshold and reset the subtraction after threshold within groups in pandas dataframe in python?
This is a dataframe, with 4 columns. The primary dataframe contains two columns, trip and timestamps, and I calculated ‘TimeDistance’ which is the difference between rows of timestamps, and ‘cum’ which is the cumulative sum over TimeDistance column. in order to reach my goal, but I cou…
Django Rest API from Database
I have 2 APIs from my existing project. Where One provides the latest blog posts and another one provides sorting details. The 2nd API (sorting) gives blog posts ID and an ordering number, which should be in the 1st,2nd,3rd…n position. If I filter in the first API with that given ID I can get the blog p…
Why Does Python Method Needs a `self` pointer for Recursion to Work?
I’m new to Python and want to use it for LeetCode. I was doing a recursion problem and realized that I have to use self. pointer in order for the recursion to work. Here is my initial code: However, this would give me an error: I had to add a self. before reverseList() in order for it to work. I’m