dropping rows from dataframe based on a “not in” condition
ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
pandas
Improve Row Append Performance On Pandas DataFrames
I am running a basic script that loops over a nested dictionary, grabs data from each record, and appends it to a Pandas DataFrame. The data looks something like this:
Python remove stop words from pandas dataframe
I want to remove the stop words from my column “tweets”. How do I iterative over each row and each item?
Changing multiple column names but not all of them – Pandas Python
I would like to know if there is a function to change specific column names but without selecting a specific name or without changing all of them.
pandas to_csv output quoting issue
I’m having trouble getting the pandas dataframe.to_csv(...) output quoting strings right.
pivot_table No numeric types to aggregate
I want to make a pivot table from the following dataframe with columns sales, rep. The pivot table shows sales but no rep. When I tried with only rep, I got the error DataError: No numeric types to aggregate. How to fix this such that I see both the numeric field sales and the field(string) rep
Python pandas – filter rows after groupby
For example, I have the following table:
How to add/subtract time (hours, minutes, etc.) from a Pandas DataFrame.Index whos objects are of type datetime.time?
I’ve got a DataFrame who’s index is just datetime.time and there’s no method in DataFrame.Index and datetime.time to shift the time. datetime.time has replace but that’ll only work on individual items of the Series?
Pandas pd.Series.isin performance with set versus array
In Python generally, membership of a hashable collection is best tested via set. We know this because the use of hashing gives us O(1) lookup complexity versus O(n) for list or np.ndarray.
custom matplotlib plot : chess board like table with colored cells
I am starting to render plots with matplotlib as I learn both python and this interesting plotting library. I need help with a custom plot for a problem I am working on. May be there is an inbuilt function already for this.