Is there a built-in function to create a pandas.Series column using a dictionary as mapper and index levels in the data frame ? The idea is to create a new column based on values in index levels and a dictionary. For instance: Let’s suppose the following data frame, where id, name and code and different…
Tag: dictionary
how to add just the values in key s1 [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 4 years ago. Improve this question List item Answer If you want to add all the values of s1, you need to iterate over the value…
Python Pandas Loop through Dictionary Keys (which are tuples) and plot variables against each other
I have a correlation matrix (in the form of a DataFrame) from which I return a Series which is the top n correlated pairs of columns and the value of the correlation: See this for an example of what I mean. I take the resulting Series object and then cast as a dictionary like so: The resulting keys of this
How to implement a factory class?
I want to be able to create objects based on an enumeration class, and use a dictionary. Something like this: But I get the error: For some reason the dictionary can’t be created. Where am I going wrong here? Answer After looking at Bruce Eckel’s book I came up with this: This gets the user to sel…
Expand a dict containing list items into a list of dict pairs
If I have a dictionary containing lists in one or more of its values: How can I get a list of dict tuples paired by pair and iterating over c, with all else remaining constant? E.g. Answer Well, this doesn’t feel especially elegant, but you might use a nested for loop or list comprehension: or A cleaner…
Creating a nested dictionary from a flattened dictionary
I have a flattened dictionary which I want to make into a nested one, of the form I want to convert it to the form The structure of the flat dictionary is such that there should not be any problems with ambiguities. I want it to work for dictionaries of arbitrary depth, but performance is not really an issue.…
convert dataframe row to dict
I have datarame like the sample data below. I’m trying to convert one row from the dataframe in to a dict like the desired output below. But when I use to_dict I get the indice along with the column value. Does anyone know how to get convert the row to a dict like the desired output? Any tips greatly ap…
is there a faster way to get multiple keys from dictionary?
I have a dictionary: Then I have a list of keys: My desired result is: What I’m doing so far is: Is there a faster way? Perhaps without for? Answer You could use: It has two advantages: It performs the d.get lookup only once – not each iteration Only CPython: Because dict.get is implemented in C a…
Python dictionary counter positions change
So i’m trying to count the most repeated values in an text file. By using the Counter method it returns exaclty what im looking for file.txt script.py OUTPUT But as you can see the output of the final array is not in the same order as the dictionary (value should be in descending order) I am expecting a…
count the number of occurrences of a certain value in a dictionary in python?
If I have got something like this: If I want for example to count the number of occurrences for the “0” as a value without having to iterate the whole list, is that even possible and how? Answer As mentioned in THIS ANSWER using operator.countOf() is the way to go but you can also use a generator …