Python 将项目添加到 pandas.Series？
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Add item to pandas.Series?
提问by Michael
I want to add an integer to my pandas.Series
Here is my code:
我想添加一个整数到我pandas.Series
这里是我的代码：
import pandas as pd
input = pd.Series([1,2,3,4,5])
input.append(6)
When i run this, i get the following error:
当我运行它时，我收到以下错误：
Traceback (most recent call last):
File "<pyshell#9>", line 1, in <module>
f.append(6)
File "C:\Python33\lib\site-packages\pandas\core\series.py", line 2047, in append
verify_integrity=verify_integrity)
File "C:\Python33\lib\site-packages\pandas\tools\merge.py", line 878, in concat
verify_integrity=verify_integrity)
File "C:\Python33\lib\site-packages\pandas\tools\merge.py", line 954, in __init__
self.new_axes = self._get_new_axes()
File "C:\Python33\lib\site-packages\pandas\tools\merge.py", line 1146, in _get_new_axes
concat_axis = self._get_concat_axis()
File "C:\Python33\lib\site-packages\pandas\tools\merge.py", line 1163, in _get_concat_axis
indexes = [x.index for x in self.objs]
File "C:\Python33\lib\site-packages\pandas\tools\merge.py", line 1163, in <listcomp>
indexes = [x.index for x in self.objs]
AttributeError: 'int' object has no attribute 'index'
How can I fix that?
我该如何解决？
采纳答案by alko
Convert appended item to Series:
将附加项目转换为Series：
>>> ds = pd.Series([1,2,3,4,5])
>>> ds.append(pd.Series([6]))
0 1
1 2
2 3
3 4
4 5
0 6
dtype: int64
or use DataFrame:
或使用DataFrame：
>>> df = pd.DataFrame(ds)
>>> df.append([6], ignore_index=True)
0
0 1
1 2
2 3
3 4
4 5
5 6
and last option if your index is without gaps,
如果您的索引没有间隙，最后一个选项，
>>> ds.set_value(max(ds.index) + 1, 6)
0 1
1 2
2 3
3 4
4 5
5 6
dtype: int64
And you can use numpy as a last resort:
你可以使用 numpy 作为最后的手段：
>>> import numpy as np
>>> pd.Series(np.concatenate((ds.values, [6])))
回答by Gormoruk
set_value shows warning:
set_value 显示警告：
FutureWarning: set_value is deprecated and will be removed in a future release. Please use .at[] or .iat[] accessors instead
FutureWarning: set_value 已弃用，将在未来版本中删除。请改用 .at[] 或 .iat[] 访问器
so you can use 'at' as follows:
所以你可以使用 'at' 如下：
input.at[input.index[-1]+1]=6
