Issue creating new columns based on existing columns in DataFrame – PerformanceWarning: DataFrame is highly fragmented Question: I want to create X number of new columns in a pandas dataframe based on an existing column of the dataframe. I would like to create new columns that shift the values in the original column by 1 …
Python/Pandas. For loop on multiple dataFrames not working correctly Question: I am trying to process a list of dataframes (example shows 2, reality has much more) in multiple ways using a for loop. Droping columns in the dataframe referenced in the loop works fine, however, concat doesn’t do anything inside the loop. I expect to …
Concatenating similar items in a list – Python Question: I have a list of similar and unique words. The similar words are appeared in one string and are separated by "|". input = ["car | cat", "cat | caat", "car | caar", "dog", "ant | ants"] I want to get the following output so that …
How can I concatenate all .txt files in a folder and separate all of them with a line? Question: I’m very new to using Python, and I suspect this is easier than I think, but I have a lot (more than 200) .txt files in a folder that I would like to concatenate in a …
Combining xarray datasets with combine_by_coords() for 2 dimensions simultaneously in python Question: I have multiple xarray datasets with the dimensions: target-latitudes (180) and target-longitudes 360) and one variable: variable1. Each of these datasets represents a source-gridcell and thus corresponds to a particular source-latitude and source-longitude; e.g., the dataset sourcelat25_sourcelon126_mm3_per_yr.nc corresponds to a gridcell with the …
Adding new column to merged DataFrame based on pre-merged DataFrames Question: I have two DataFrames, df1 and df2. In my code I used Pandas.concat method to find the differences between them. df1 = pd.read_excel(latest_file, 0) df2 = pd.read_excel(latest_file, 1) #Reads first and second sheet inside spreadsheet. new_dataframe = pd.concat([df1,df2]).drop_duplicates(keep=False) This works perfectly, however I want …
Pandas Concat vs append and join columns –> ("state", "state:", "State") Question: I join 437 tables and I get 3 columns for state as my coworkers feel like giving it a different name each day, ("state", "state:" and "State"), is there a way that joins those 3 columns to just 1 column called "state"?. *also …
How do I combine two different row string values into a single new row value? Question: I have two rows of a dataframe likeso: Jan Feb a 1 3 b 2 4 I want to create a new dataframe row that combines the two rows (by name because I have to do this for multiple …
Combine multiple columns as a string in python Question: I am trying to combine multiple columns from a dataframe into a new column in the same dataframe. Those columns could either have a string value or are Na or NaN. Whenever one column is Na/NaN, I would like these columns to not be included in …
How to search for a specific date within concatenated DataFrame TimeSeries. Same Date would repeat several times in a merged df Question: I downloaded historical price data for ^GSPC Share Market Index (S&P500), and several other Global Indices. Date is set as index. Selecting values in rows when date is set to index works as …
