Python 无法使用pandas提取数据帧列
我是新来的熊猫,正在努力重命名一列,然后提取相同的 我已将xls文件读入熊猫数据帧对象Python 无法使用pandas提取数据帧列,python,pandas,data-science,data-cleaning,Python,Pandas,Data Science,Data Cleaning,我是新来的熊猫,正在努力重命名一列,然后提取相同的 我已将xls文件读入熊猫数据帧对象 df = pd.read_excel("something.xls") bank_statement.columns.values[0] = 'Din' bank_statement.columns 这显示了列 Index([u'Din', u'Unnamed: 1', u'Unnamed: 2', u'Unnamed: 3', u'Unnamed: 4', u'Unnamed: 5', u'
df = pd.read_excel("something.xls")
bank_statement.columns.values[0] = 'Din'
bank_statement.columns
这显示了列
Index([u'Din', u'Unnamed: 1', u'Unnamed: 2', u'Unnamed: 3', u'Unnamed: 4',
u'Unnamed: 5', u'Unnamed: 6'],
dtype='object')
但这会导致错误
bank_statement.Din
错误是:
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-11-6ce73c262cd1> in <module>()
----> 1 bank_statement.Din
/Users/monideepde/anaconda2/lib/python2.7/site-packages/pandas/core/generic.pyc in __getattr__(self, name)
3612 if name in self._info_axis:
3613 return self[name]
-> 3614 return object.__getattribute__(self, name)
3615
3616 def __setattr__(self, name, value):
AttributeError: 'DataFrame' object has no attribute 'Din'
我可以访问这些列
Index([u'Din', u'Unnamed: 1', u'Unnamed: 2', u'Unnamed: 3', u'Unnamed: 4',
u'Unnamed: 5', u'Unnamed: 6'],
dtype='object')
有人能指出我哪里出了问题吗
谢谢不要使用
更新内部结构。值
:
bank_statement.columns.values[0] = 'Din'
改用相应的API函数/方法:
bank_statement = bank_statement.rename(columns={'Unnamed: 0':'Din'})
演示:
让我们来破解它:
In [219]: df.columns.values[0] = 'Din'
这似乎奏效了:
In [220]: df.columns
Out[220]: Index(['Din', 'b', 'c'], dtype='object')
但是:
惊喜Pandas仍然认为它有一个a
列:
In [222]: df['a']
Out[222]:
0 -0.972161
1 1.081694
2 -0.581193
Name: Din, dtype: float64
解决方法:
In [224]: df.columns = ['Din'] + df.columns.tolist()[1:]
In [225]: df.columns
Out[225]: Index(['Din', 'b', 'c'], dtype='object')
In [226]: df['Din']
Out[226]:
0 -0.972161
1 1.081694
2 -0.581193
Name: Din, dtype: float64
这可能是相关的:非常感谢您的详细回复!出于好奇-df.columns.values[0]=“Din”不起作用!你知道是什么原因吗?它是一个bug(因为提供了一个API,但它不工作),还是有一个合理的理由让它按照自己的方式工作?
In [222]: df['a']
Out[222]:
0 -0.972161
1 1.081694
2 -0.581193
Name: Din, dtype: float64
In [224]: df.columns = ['Din'] + df.columns.tolist()[1:]
In [225]: df.columns
Out[225]: Index(['Din', 'b', 'c'], dtype='object')
In [226]: df['Din']
Out[226]:
0 -0.972161
1 1.081694
2 -0.581193
Name: Din, dtype: float64