Intersection of two pandas dataframes based on column entries Question: Suppose I have two DataFrames like so: >>dfA S T prob 0 ! ! ! ! ! ! 8.1623999e-05 1 ! ! ! ! ! ! " 0.00354090007 2 ! ! ! ! ! ! . 0.00210241997 3 ! ! ! ! ! ! ? …
Python set Union and set Intersection operate differently? Question: I’m doing some set operations in Python, and I noticed something odd.. >> set([1,2,3]) | set([2,3,4]) set([1, 2, 3, 4]) >> set().union(*[[1,2,3], [2,3,4]]) set([1, 2, 3, 4]) That’s good, expected behaviour – but with intersection: >> set([1,2,3]) & set([2,3,4]) set([2, 3]) >> set().intersection(*[[1,2,3], [2,3,4]]) set([]) Am …
Intersecting two dictionaries Question: I am working on a search program over an inverted index. The index itself is a dictionary whose keys are terms and whose values are themselves dictionaries of short documents, with ID numbers as keys and their text content as values. To perform an ‘AND’ search for two terms, I thus …
Finding the intersection between two series in Pandas Question: I have two series s1 and s2 in pandas and want to compute the intersection i.e. where all of the values of the series are common. How would I use the concat function to do this? I have been trying to work it out but have …
Ray and square/rectangle intersection in 3D Question: Hei. Are making a game and are looking for a ray intersection onto a square or a rectangle only in 3D space. Have search the web and found many solutions but nothing i can understand have a line and line segment intersection script in 2D but i cant …
Removing duplicates in lists Question: How can I check if a list has any duplicates and return a new list without duplicates? Asked By: Neemaximo || Source Answers: The common approach to get a unique collection of items is to use a set. Sets are unordered collections of distinct objects. To create a set from …
Python -Intersection of multiple lists? Question: I am playing with python and am able to get the intersection of two lists: result = set(a).intersection(b) Now if d is a list containing a and b and a third element c, is there an built-in function for finding the intersection of all the three lists inside d? …
How to find list intersection? Question: a = [1,2,3,4,5] b = [1,3,5,6] c = a and b print c actual output: [1,3,5,6] expected output: [1,3,5] How can we achieve a boolean AND operation (list intersection) on two lists? Asked By: csguy11 || Source Answers: If order is not important and you don’t need to worry …
Test if lists share any items in python Question: I want to check if any of the items in one list are present in another list. I can do it simply with the code below, but I suspect there might be a library function to do this. If not, is there a more pythonic method …
efficiently knowing if intersection of two list is empty or not, in python Question: Suppose I have two lists, L and M. Now I want to know if they share an element. Which would be the fastest way of asking (in python) if they share an element? I don’t care which elements they share, or …
