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 there a better
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 adding regex=True
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 values. Its working fine with
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 ValueError: Wrong number of items passed 4, placement implies 1 because
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