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How can i classify and handle pandas drop duplicate columns

Asked by Aashish Chaursiya Sep 26, 2024 1.2K views 6 answers
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I want to find & remove duplicate column names in the data frames. I have a dataframe with various data types such as integers, objects, floats etc. 


there are two conditions that we have for a dataframe to be found and removed:

1. the column name of dataframe is same

2. values present in the columns are same


I have tried doing df.T.duplicated() but it is too slow for big dataframes, also while browsing i got to know about pivot, pivot_table or corr to list duplicate column names.


Please make me understand when we should use these three things and if there is any other thing we can do?

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6 Answers

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Asher Magnus

Answered on Nov 26, 2024

Thanks for sharing this very interesting question! Finding and removing duplicate column names can be a challenge with large data. As you said, pivot, pivot_table, Snow Rider, and corr can help in certain cases, but to identify duplicate columns in both name and value, I think you should try a more efficient approach by using df.columns.duplicated() to detect duplicate columns in name, then compare the values ​​of these columns to remove them. Optimizing with these methods will help to process large data faster.

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Destinfeest

Answered on Nov 17, 2024

In some cases, you may have columns fall guys with the same name but with an additional prefix (like _duplicate or _1), and you want to treat them as a group. To handle this, you can normalize the column names and then work with these columns.

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