[英]Append two Pandas series to a dataframe by columns
我有一個數據幀和兩個Pandas系列ac和cc,我想將這兩個系列作為列附加。 但問題是我的數據幀有時間索引,系列為整數
A='a'
cc = pd.Series(np.zeros(len(A)*20))
ac = pd.Series(np.random.randn(10))
我試試這個,但我有一個空的數據幀
index = pd.date_range(start=pd.datetime(2017, 1,1), end=pd.datetime(2017, 1, 2), freq='1h')
df = pd.DataFrame(index=index)
df = df.join(pd.concat([pd.DataFrame(cc).T] * len(df), ignore_index=True))
df = df.join(pd.concat([pd.DataFrame(ac).T] * len(df), ignore_index=True))
最終結果應該是這樣的:
cc ac
2017-01-01 00:00:00 1 0.247043
2017-01-01 01:00:00 1 -0.324868
2017-01-01 02:00:00 1 -0.004868
2017-01-01 03:00:00 1 0.047043
2017-01-01 04:00:00 1 -0.447043
2017-01-01 05:00:00 NaN NaN
... ... ...
如果我們在最終結果中總是有NaN,那不是問題。
編輯:
在@piRSquared的答案之后,我必須添加一個循環,但我在鍵中出錯:
az = [cc, ac]
for i in az:
df.join(
pd.concat(
[pd.Series(s.values, index[:len(s)]) for s in [i]],
axis=1, keys=[i]
)
)
ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
df.join(
pd.concat(
[pd.Series(s.values, index[:len(s)]) for s in [cc, ac]],
axis=1, keys=['cc', 'ac']
)
)
cc ac
2017-01-01 00:00:00 0.0 -0.319653
2017-01-01 01:00:00 0.0 0.630061
2017-01-01 02:00:00 0.0 -1.648402
2017-01-01 03:00:00 0.0 -1.141017
2017-01-01 04:00:00 0.0 -0.643353
2017-01-01 05:00:00 0.0 0.718771
2017-01-01 06:00:00 0.0 0.379173
2017-01-01 07:00:00 0.0 1.799804
2017-01-01 08:00:00 0.0 0.883260
2017-01-01 09:00:00 0.0 0.788289
2017-01-01 10:00:00 0.0 NaN
2017-01-01 11:00:00 0.0 NaN
2017-01-01 12:00:00 0.0 NaN
2017-01-01 13:00:00 0.0 NaN
2017-01-01 14:00:00 0.0 NaN
2017-01-01 15:00:00 0.0 NaN
2017-01-01 16:00:00 0.0 NaN
2017-01-01 17:00:00 0.0 NaN
2017-01-01 18:00:00 0.0 NaN
2017-01-01 19:00:00 0.0 NaN
2017-01-01 20:00:00 NaN NaN
2017-01-01 21:00:00 NaN NaN
2017-01-01 22:00:00 NaN NaN
2017-01-01 23:00:00 NaN NaN
2017-01-02 00:00:00 NaN NaN
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