If you do for example mathematical operations with columns of a python pandas dataframe (call it data), you repeatedly have to write data do access the columns, which is very annoying, if you want nice to read mathematical formulas. So I am looking for a way to “factor out” the data keyword. Consider this simple example: Where data.dat is Answer
Tag: pandas
Add a character at start of a regex match in Pandas
I have a dataframe that has two columns, id and text In the text field, whenever there is a digit preceded by a space, I want to add a # before the digit. The resultant dataframe that I am looking for would be as follows: I have tried the following method to capture the regex pattern and add the #
Read Excel file that is located outside the folder containing the module into Pandas DataFrame
I want to read an excel file into pandas DataFrame. The module from which I want to read the file is inputs.py and the excel file (schoolsData.xlsx) that I want to read is outside the folder containing the module. I’m doing it like this in my code Error: No such file or directory: ‘../schoolsData.xlsx’ The strange thing is that it
How to quickly subset many dataframes?
I have 180 DataFrame objects, each one has 3130 rows and it’s about 300KB in memory. The index is a DatetimeIndex, business days from 2000-01-03 to 2011-12-31: I preprocess all the data taking advantage of numpy/pandas vectorization, then I have to loop through the dataframes day by day. To prevent the possibility of ‘look ahead bias’ and get data from
Selecting/Manuplating cells based on their location in the dataframe
I have a dataframe as below I want to multiply every 3rd column after the 2 column in the last 2 rows by 5 to get the ouput as below. How to acomplish this? I am able to select the cells i need with df.iloc[-2:,1::3] which results in the df as below but I am not able to proceed further.
How to plot each column with each column from Pandas Dataframe?
I were searching how create scatterplot between each column with each column. Similar question to this one and I followed the code from answer: How to make a loop for multiple scatterplots in python? What I done is: But in this solution I’m getting everything on one single plot, I want to make it separately, how I can achieve that?
Sort dataframe by substring condition excluding similar strings
I have a dataframe with a string type column named ‘tag’, tag has three categories (data_types): If I want to count the number of rows there are by each data_type in ‘tag’ column, I apply the string include condition this way But, obviously, the counting for the tag ‘DATA’ include the real ‘DATA’ rows and both ‘DATAKIND’ and ‘DATAKINDSIM’ in
get all pairs of columns where only one value in third column
I am try to get all pairs of columns where a third column has only one value, such that (given pair a,b and third column c): only returns 1,2 and 2,1 (the results from the last two rows). The first two rows are excluded since they describe the same pair but with different values in the third column. To be
How to split AFTER underscore in Python
I’ve seen a lot of threads that say how to split based on an underscore, but how can we split a string where the split is done after the underscore. So let’s say I have a pandas dataframe with one column: how can I achieve the following output? Thanks in advance. Answer You can split with the _ as a
Serach List names in a dataframe column pandas
I am trying to match my list of server with the pandas dataframe in the column Server Name if the name in the list matches in the Server Name then print the entire row. there are chances names is the my_List do not match entirely like one of the server name in my_List is tick1001.example.us.com while in Server Name. This