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 Add column to CSV using Pandas
Hey everyone,

I have a list that I made as a dataframe and I want to take this dataframe and add it to an existing CSV file with data already in it.

The csv has three columns already,


My column I want to add is "New Cases". Yes, you can guess what this is about..... Wall

I used this code and figured out quickly that this overwrites the whole CSV:

df = pd.DataFrame(data={"New_Cases": case_list})
df.to_csv("./Cook County.csv", sep=',',index=False)
Larz60+ wrote Apr-07-2020, 01:37 AM:
Please post all code, output and errors (in it's entirety) between their respective tags. Refer to BBCode help topic on how. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.
First suggestion is to follow Larz60+ advice and reformat your question. As for your original problem, a very easy way to fix that would be:
  1. Use Pandas to read the original csv into a dataframe
  2. Concatenate your original dataframe to the dataframe you created from the csv
  3. Write the new dataframe to a csv
As mention bye @UGuntupall so is the first step to get the .csv read into a DataFrame.
Then should a search help as adding a new column to a DataFram is very basic task in Pandas.
Here Notebook you can look at.

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