使用 Pandas 中的系列连接 DataFrame
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concat a DataFrame with a Series in Pandas
提问by cacert
Can someone explain what is wrong with this pandas concat code, and why data frame remains empty ?I am using anaconda distibution, and as far as I remember it was working before.
有人可以解释一下这个 Pandas concat 代码有什么问题，为什么数据框仍然是空的？我正在使用 anaconda distibution，据我所知，它以前是有效的。
采纳答案by bakkal
You want to use this form:
你想使用这个表格：
result = pd.concat([dataframe, series], axis=1)
The pd.concat(...)doesn't happen "inplace" into the original dataframebut it would returnthe concatenated result so you'll want to assign the concatenation somewhere, e.g.:
该pd.concat(...)不会发生“就地”成原来的dataframe，但它会返回连接的结果，所以你要分配的级联的地方，如：
>>> import pandas as pd
>>> s = pd.Series([1,2,3])
>>> df = pd.DataFrame()
>>> df = pd.concat([df, s], axis=1) # We assign the result back into df
>>> df
0
0 1
1 2
2 3
