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Combining multiple Series to form a DataFrame in Pandas
schedule Aug 11, 2023
Last updated local_offer
Tags Python●Pandas
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To combine multiple Series to form a DataFrame in Pandas, use the concat(~) method.
Horizontally stacking Series
To horizontally stack two Series:
s1 = pd.Series(['a','b'])s2 = pd.Series(['c','d'])df = pd.concat([s1, s2], axis=1) # returns a DataFramedf
0 10 a c1 b d
Here, both s1 and s2 share the same index ([0,1]) so they could be stacked horizontally (axis=1).
Case when index labels do not align
In the case when the index labels don't perfectly align, we would end up with missing values:
s1 = pd.Series(['a','b'], index=["A","B"])s2 = pd.Series(['c','d'], index=["B","C"])pd.concat([s1, s2], axis=1)
0 1A a NaNB b cC NaN d
Supplement - assigning new column labels
The resulting DataFrame will have the default integer indices as the column labels, so you may want to assign new labels like so:
df.columns = ["A","B"]df
A Ba a NaNb b cc NaN d
Vertically stacking Series
To vertically stack multiple Series to form a new DataFrame, use concat(~):
s1 = pd.Series(['a','b'])s2 = pd.Series(['c','d'])df = pd.concat([s1, s2], axis=0).to_frame()df
00 a1 b0 c1 d
Note the following:
axis=0forconcat(~)means that we want to stack the Series vertically, as opposed to horizontally.the return type of
concat(~)in this case is a Series, and so to convert this Series into a DataFrame, we useto_frame().
Published by Isshin Inada
Edited by 0 others
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