在dataframe python中将类别转换为列
我有一个包含两列的数据框。一列包含不同的类别,另一列包含值在dataframe python中将类别转换为列,python,pandas,dataframe,transpose,Python,Pandas,Dataframe,Transpose,我有一个包含两列的数据框。一列包含不同的类别,另一列包含值 import pandas as pd data={"category":["Topic1","Topic2","Topic3","Topic2","Topic1","Topic3"], "value":["hello","hey",&q
import pandas as pd
data={"category":["Topic1","Topic2","Topic3","Topic2","Topic1","Topic3"], "value":["hello","hey","hi","name","valuess","python"]}
df=pd.DataFrame(data=data)
我希望不同的类别列如下所示
电流输入:
category value
Topic1 hello
Topic2 hey
Topic3 hi
Topic2 name
Topic1 valuess
Topic3 python
期望输出:
Topic1 Topic2 Topic3
hello hey hi
valuess name python
我尝试使用转置数据帧,但没有得到预期的结果。您可以使用沿轴=1
。这也适用于不匹配的长度
grouper = df.groupby('category')
df = pd.concat([pd.Series(v['value'].tolist(), name=k) for k, v in grouper], axis=1)
print(df)
Topic1 Topic2 Topic3
0 hello hey hi
1 valuess name python
使用
pivot
和cumcount
(用于创建帮助键)
谢谢这个解决方案是有效的。
s = df.groupby('category')['value'].apply(list)
s.apply(pd.Series).T
category Topic1 Topic2 Topic3
0 hello hey hi
1 valuess name python
df.assign(key=df.groupby('category').cumcount()).pivot('key','category','value')
Out[381]:
category Topic1 Topic2 Topic3
key
0 hello hey hi
1 valuess name python