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Getting size of each group in Pandas

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Data Aggregation Cookbook
schedule Jul 1, 2022
Last updated
local_offer PythonPandas
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tocTable of Contents
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To get the size of each group in Pandas, use the groups' size() method.

Example

Consider the following DataFrame about some products:

df = pd.DataFrame({"price":[500,300,700, 200,900], "brand":["apple", "google", "apple", "google","apple"], "device":["phone","phone","computer","phone","phone"]}, index=["a","b","c","d","e"])
df
price brand device
a 500 apple phone
b 300 google phone
c 700 apple computer
d 200 google phone
e 900 apple phone

To get the number of products offered by each brand:

df.groupby("brand").size() # returns a Series
brand
apple 3
google 2
dtype: int64
robocat
Published by Isshin Inada
Edited by 0 others
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