Combining two Series into a DataFrame in pandas


I have two Series s1 and s2 with the same (non-consecutive) indices. How do I combine s1 and s2 to being two columns in a DataFrame and keep one of the indices as a third column?

Answer rating: 479

I think concat is a nice way to do this. If they are present it uses the name attributes of the Series as the columns (otherwise it simply numbers them):

In [1]: s1 = pd.Series([1, 2], index=["A", "B"], name="s1")

In [2]: s2 = pd.Series([3, 4], index=["A", "B"], name="s2")

In [3]: pd.concat([s1, s2], axis=1)
   s1  s2
A   1   3
B   2   4

In [4]: pd.concat([s1, s2], axis=1).reset_index()
  index  s1  s2
0     A   1   3
1     B   2   4

Note: This extends to more than 2 Series.

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