英文:
Groupby with object and datetime64[ns] leas to empty dataframe
问题
我有一个包含以下列的数据框：
print(df.dtypes)Daten float64timepoint datetime64[ns]Level objectSublevel objectdtype: object
以及以下条目：
Daten timepoint Level Sublevel1 2019-01-01T00:00:00.000 A AA1 2019-01-01T00:00:00.000 A AA2 2019-01-01T00:00:00.000 A AB2 2019-01-01T00:00:00.000 B BA1 2019-02-01T00:00:00.000 A AA
我想使用以下命令进行groupby和sum操作：
df= df.groupby(['Level', 'timepoint']).agg({'Daten': 'sum'}).reset_index()
为什么会导致一个空的数据框？
我期望的输出应该是：
timepoint Level Daten2019-01-01T00:00:00.000 A 42019-01-01T00:00:00.000 B 22019-02-01T00:00:00.000 A 1
英文:
I have a dataframe with the following columns:
print(df.dtypes)Daten float64timepoint datetime64[ns]Level objectSublevel objectdtype: object
and the following entries:
Daten timepoint Level Sublevel1 2019-01-01T00:00:00.000 A AA1 2019-01-01T00:00:00.000 A AA2 2019-01-01T00:00:00.000 A AB2 2019-01-01T00:00:00.000 B BA1 2019-02-01T00:00:00.000 A AA
I want to groupbyand sum with the following command:
df= df.groupby(['Level', 'timepoint']).agg({'Daten': 'sum'}).reset_index()
why does this lead to an empty dataframe?
My expected output would be:
timepoint Level Daten2019-01-01T00:00:00.000 A 42019-01-01T00:00:00.000 B 22019-02-01T00:00:00.000 A 1
答案1
得分: 0
不知何故，这段代码可以工作：
df['timepoint'] = df['timepoint'].astype(str)df = df.groupby(['Level', 'timepoint']).agg({'Daten': 'sum'}).reset_index()df['timepoint'] = pd.to_datetime(df['timepoint'])
英文:
Somehow this works:
df['timepoint'] = df['timepoint'].astype(str)df = df.groupby(['Level', 'timepoint']).agg({'Daten': 'sum'}).reset_index()df['timepoint'] = pd.to_datetime(df['timepoint'])
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