How do I convert a list in a Pandas DF into a string?

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You should certainly not convert to string before you transform the list. Try:

df['col'].apply(', '.join)

Also note that apply applies the function to the elements of the series, so using df['col'] in the lambda function is probably not what you want.

Or, there is a native .str.join method, but it is (surprisingly) a bit slower than apply.

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