group by pandas examples

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showing results for - "group by pandas examples"
Dawson
06 May 2018
1>>> n_by_state = df.groupby("state")["state"].count()
2>>> n_by_state.head(10)
3state
4AK     16
5AL    206
6AR    117
7AS      2
8AZ     48
9CA    361
10CO     90
11CT    240
12DC      2
13DE     97
14Name: last_name, dtype: int64
15
Lilian
21 Nov 2018
1# Groups the DataFrame using the specified columns
2
3df.groupBy().avg().collect()
4# [Row(avg(age)=3.5)]
5sorted(df.groupBy('name').agg({'age': 'mean'}).collect())
6# [Row(name='Alice', avg(age)=2.0), Row(name='Bob', avg(age)=5.0)]
7sorted(df.groupBy(df.name).avg().collect())
8# [Row(name='Alice', avg(age)=2.0), Row(name='Bob', avg(age)=5.0)]
9sorted(df.groupBy(['name', df.age]).count().collect())
10# [Row(name='Alice', age=2, count=1), Row(name='Bob', age=5, count=1)]
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