[英]python pandas: Rename a series within a dataframe?
I'm using python pandas for data analysis and I want to change the name of a series in a dataframe. 我正在使用python pandas进行数据分析,我想更改数据框中的系列名称。
This works, but it seems very inefficient: 这可行,但效率似乎很低:
AA = pandas.DataFrame( A )
for series in A:
AA[A_prefix+series] = A[series]
del A[series]
Is there a way to change the series name in place? 有没有办法更改系列名称?
Sure, you can use the rename method: 当然,您可以使用重命名方法:
In [11]: df = DataFrame({"A": [1,2], "B": [3,4]})
In [12]: df.rename(columns={"A": "series formerly known as A"})
Out[12]:
series formerly known as A B
0 1 3
1 2 4
This doesn't change df
, though: 但这不会改变
df
:
In [13]: df
Out[13]:
A B
0 1 3
1 2 4
You can get that behaviour if you want using inplace
: 如果要使用
inplace
,则可以得到该行为:
In [14]: df.rename(columns={"A": "series formerly known as A"}, inplace=True)
Out[14]:
series formerly known as A B
0 1 3
1 2 4
In [15]: df
Out[15]:
series formerly known as A B
0 1 3
1 2 4
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