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# Combining two columns as a single column of tuples in Pandas

schedule Aug 12, 2023
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To combine two columns as a single column of tuples, use the DataFrame's `apply(tuple)` method.

Consider the following DataFrame:

``` df = pd.DataFrame({"A":[3,4],"B":[5,6],"C":[7,8]}, index=["a","b"])df A B Ca 3 5 7b 4 6 8 ```

# Solution

To combine columns `A` and `B` to form a new column `D` of tuples:

``` df["D"] = df[["A","B"]].apply(tuple, axis=1)df A B C Da 3 5 7 (3, 5)b 4 6 8 (4, 6) ```

# Explanation

We first begin by extracting columns `A` and `B` as a DataFrame:

``` df[["A","B"]] A Ba 3 5b 4 6 ```

We then iterate through each row (`axis=1`), and then form a tuple row-wise:

``` df[["A","B"]].apply(tuple, axis=1) a (3, 5)b (4, 6)dtype: object ```
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