The below two dataframes df1 and df2 have been manually entered into Python. Then the dataframes were merged into df3. How can I make sure that the final merged dataframe df3 is using the same descending (chronological) order (as for the initial dataframes df1 and df2)(as it is not a case by default)? Thanks …
Tag: pandas
Merging pandas get_dummies back to categorical values
I have a pandas dataframe which I have one hot encoded with get_dummies, the data previously had a ‘type’ column which contained the values small_airport, large_airport, medium_airport, I split the type column in to each different type of airport with 1s and 0s where the frequencies matched. After…
Multiply rows in pandas DataFrame depending on values from c
I would like to get from this: nname eemail email2 email3 email4 Stan stan@example.com NO stan1@example.com NO Danny danny@example.com danny1@example.com danny2@example.com danny3@example.com Elle elle@example.com NO NO NO To this: nname eemail Stan stan@example.com Stan stan1@example.com Danny danny@example.…
I cannot change the values of a column with specific condition
The table looks like the following: text dummy1 days op123ac 1 2000-01-01 op123ac 0 2000-01-04 op123ac 0 2000-01-07 op123ac 0 2000-01-10 op1248ab 0 2000-01-17 op1248ab 1 2000-01-20 op1248ab 1 2000-01-23 op1248ab 1 2000-01-26 Each unique “text” have four repeated values correspond to four unique &#…
Add missing rows in pandas DataFrame
I have a DataFrame that looks like this: What I want to get is: In short, for each id, add the time rows missing with value 0. How do I do this? I wrote something with a loop, but it’s going to be prohibitively slow for my use case which has several million rows Answer Here’s one way using groupby…
How to remove brackets from multi-value keys when converting to dataframes or extend values of a key without extraneous characters
The above code handles a nested dictionary to dataframe conversion perfectly fine but if you have a nested dictionary created with the .append() or .extend() method it adds extraneous brackets[] and quotes ” which is making downstream analysis difficult. For example for a nested dictionary like this: cr…
How to calculate the average R square of the company data [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 10 months ago. Improve this question STOCK RETURN I don’t know how to compute the average r squared with individual stock…
Pandas chart using plotly.graph_objects DO NOT ALLOW FOR ‘c’ or ‘color’ ATTRIBUTE
I am adding line charts to an OHLV plotly, but I do not manage to color them. The above code fail when I use ‘color’ as a ‘figg.add_scatter’ attribute : Error given is: WHEN I do not specidy the color of the the scatter lines, the program works fine. Bellow is a data sample: I would li…
DataFrame has two features how to add a row to split them
I have a DataFrame that contains a column called feature that can have more than one of them as illustrated in the image below row 3 & 4. How do a add a row to the DataFrame that splits the two features: so for row 3 as an example having: and row 4: so the idea is to add a
How do I split a Pandas DataFrame into sub-arrays (specific use case outlined in detail)?
I apologize for the title, but I don’t know enough to properly condense my question into a single line. Here is the use case: I have a pd.DataFrame with arbitrary index values and a column, ‘timestamp’. I have an ordered List of timestamp values. I want to split the DataFrame into chunks wit…