IIUC, you can chain the join instead of using concat as you have duplicated index values. If you have only 3 dataframes, you can probably ... ... <看更多>

append : Concatenate DataFrames. DataFrame.join : Join DataFrames using indexes. DataFrame.merge : Merge DataFrames by indexes or columns. ... <看更多>

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Here we'll take a look at simple concatenation of Series and DataFrame s with the pd.concat function; later we'll dive into more sophisticated in-memory ... ... <看更多>

There's no need to create a lambda for this. Let's suppose we have the following dataframe: my_df = pd.DataFrame({ 'Apple': ['1', '4', '7'], 'Pear': ['2', ... ... <看更多>