I have a data-frame I want to make a new column titled P_3 such that: My conditions are: I have applied the following codes: But it gives me the following error: Answer In summary, your unique condition is: combine_first: update null elements with value in the same location in other (ref: Pandas doc.)
Sample points from a hyperboloid
A hyperboloid has the formula -x^2/a^2 – y^2/b^2 + z^2/c^2 = 1. How can I generate samples from this hyperboloid in Python? (Say, with a=b=c=1.) I was thinking to pick random x and y in [0,1] and then fill in the z value that would make the formula equal 1. However this would not sample uniformly. Is th…
Can’t access full iteration of dictionary outside of for loop python
The problem I am trying to access my tag_dict dictionary variable outside of a for loop so I can use that dictionary to learn how to insert that data into sqlite. (First Sqlite project) If I print the tag_dict inside of the for loop it gives me all the data. Here is the code: Here is the result if I
Obtaining full requested url address
I’m looking to obtain the full requested url within python/django. I’m wondering what package might help me do this. For example, if someone goes to example.com/my-homepage, I want to capture the string ‘example.com/my-homepage’ in python. Thanks! Answer
New line character not being replaced even after trying many methods
I cannot get this to replicate outside of this file, since if I try it on a string myself it works, but for some reason not in my dataframe. I just want to get rid of the ‘n’ characters in my strings, but its not working, as seen below. I’ve tried the following, with no success Answer Try ad…
Is it possible to get binary count from Counter() Python
Using Counter(), I want to do a binary count of variables in a list. So instead of getting the count for each variable, I would simply like to have a Counter() variable, in which all values are one. So for a given list: I want the output to be: Instead of: I am aware that I could loop through the
How to pass web element from Python selenium to Java?
I am making a program that finds all the elements of a webpage with the word “Pens” and changes the text to asteriks. Here is the portion of my code I am having issues with: The code only works for elements that have an ID. I would like to send the Xpath of the element but the only methods of
Integer overflow while calculating all possible sums of n*m matrix rows
I am using this code to compute all possible sum of a n x m matrix. The code is working absolutely fine and it is fast too when using arrays of 32-bit integers like [[777,675,888],[768,777,698]]. It is using the Numpy package. However, as soon as I use 128-bit integers or bigger, I start getting negative valu…
Python Pandas – Lookup a variable column depending on another column’s value
I’m trying to use the value of one cell to find the value of a cell in another column. The first cell value (‘source’) dictates which column to lookup. My required output value in the ‘output’ column is a lookup of the ‘source’: Failed attempts This results in a Value…
Scroll to the bottom of a web page on a element in selenium
How do you scroll on a scrolling element in Python Selenium? (not the page itself but some element where you can scroll) For example, go here: here Then hit enter a lot of times in the “answer” text box. You can see that it creates a scroll bar on the text box only. How do I scroll through that in