问题描述
在pandas文档中运行代码示例时,我收到错误。我怀疑这可能与我正在使用的熊猫版本有关,但我无法确认。
pandas VERSION 0.10.1
numpy VERSION 1.7.0
scipy VERSION 0.12.0.dev- 14b1e07
以下示例直接来自熊猫文档:
这个工作原理
from datetime import datetime,timedelta
from pandas import *
s =系列(date_range('2012-1-1',periods = 3,freq ='D'))
s
输出[52]:
0 2012-01-01 00:00:00
1 2012-01-02 00:00:00
2 2012-01-03 00:00:00
这样
td =系列([timedelta(days = i)for i in range(3)])
td
Out [53]:
0 0:00:00
1 1天,0 :00:00
2 2天,0:00:00
df = DataFrame(dict(A = s,B = td))
df
输出[54] :
AB
0 2012-01-01 00:00:00 0:00:00
1 2012-01-02 00:00:00 1天,0:00:00
2 2012-01-03 00:00:00 2天,0:00:00
这似乎与文档中预期的输出一致。
示例代码中的下一行产生错误:
df ['C'] = df ['A'] + df ['B']
..
------------------------ -------------------------------------------------- -
TypeError追溯(最近的最后一次调用)
< ipython-input-55-7057e174d79e>在< module>()
----> 1 df ['C'] = df ['A'] + df ['B']
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site- package / pandas / core / series.pyc in wrapper(self,other)
91 if self.index.equals(other.index):
92 name = _maybe_match_name(自我,其他)
---> 93返回系列(wrap_results(na_op(lvalues,rvalues)),
94 index = self.index,name = name)
95
/Library/Frameworks/Python.framework /Versions/2.7/lib/python2.7/site-packages/pandas/core/series.pyc in na_op(x,y)
63 if isinstance(y,np.ndarray):
64 mask = notnull(x)& notnull(y)
---> 65个结果[mask] = op(x [mask],y [mask])
66 else:
67 mask = notnull(x)
TypeError:ufunc add不能使用类型为dtype('< M8 [ns]')和dtype('O')的操作数
数据类型:
df.dtypes
输出[56]:
A datetime64 [ns ]
B对象
同样,当我做加法/减法时,我得到一个错误: / p>
s - s.max()
< ipython-input-57-8d53e24db927>在< module>()
----> 1 s - s.max()
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/series.pyc in wrapper(self ,其他)
78
79 if(com.is_datetime64_dtype(self)and
---> 80 com.is_datetime64_dtype(other)):
81 lvalues = lvalues.view ('i8')
82 rvalues = rvalues.view('i8')
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages /pandas/core/common.pyc in is_datetime64_dtype(arr_or_dtype)
1003 tipo = arr_or_dtype.type
1004 else:
- > 1005 tipo = arr_or_dtype.dtype.type
1006 return issubclass(tipo,np.datetime64)
1007
AttributeError:'Timestamp'对象没有属性'dtype'
此代码是一个要点,方便参考。
感谢任何帮助或建议;非常感谢。
-Austin
如果你看在您链接到的页面标题(您的浏览器窗口的顶部),您可以看到它是熊猫的开发版本:
所以今天,这是版本
'0.11.0.dev-13ae597'
此代码正常工作。
稳定版本的文档在这里:
您将在浏览器窗口的顶部看到
熊猫0.10.1
这是您的版本。
I'm getting errors when running the code samples from the pandas documentation.
I suspect it might be related to the version of pandas I'm using, but I haven't been able to confirm that.
pandas VERSION 0.10.1
numpy VERSION 1.7.0
scipy VERSION 0.12.0.dev-14b1e07
The below examples are taken directly from the pandas documentation here:
pandas - Time Deltas
This works
from datetime import datetime, timedelta
from pandas import *
s = Series(date_range('2012-1-1', periods=3, freq='D'))
s
Out[52]:
0 2012-01-01 00:00:00
1 2012-01-02 00:00:00
2 2012-01-03 00:00:00
as does this
td = Series([ timedelta(days=i) for i in range(3) ])
td
Out[53]:
0 0:00:00
1 1 day, 0:00:00
2 2 days, 0:00:00
df = DataFrame(dict(A = s, B = td))
df
Out[54]:
A B
0 2012-01-01 00:00:00 0:00:00
1 2012-01-02 00:00:00 1 day, 0:00:00
2 2012-01-03 00:00:00 2 days, 0:00:00
This seems to be consistent with the expected output according to the documentation.
The next line in the sample code yields an error:
df['C'] = df['A'] + df['B']
...
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-55-7057e174d79e> in <module>()
----> 1 df['C'] = df['A'] + df['B']
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/series.pyc in wrapper(self, other)
91 if self.index.equals(other.index):
92 name = _maybe_match_name(self, other)
---> 93 return Series(wrap_results(na_op(lvalues, rvalues)),
94 index=self.index, name=name)
95
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/series.pyc in na_op(x, y)
63 if isinstance(y, np.ndarray):
64 mask = notnull(x) & notnull(y)
---> 65 result[mask] = op(x[mask], y[mask])
66 else:
67 mask = notnull(x)
TypeError: ufunc add cannot use operands with types dtype('<M8[ns]') and dtype('O')
Datatypes:
df.dtypes
Out[56]:
A datetime64[ns]
B object
Similarly, I get an error when I do addition/subtraction:
s - s.max()
<ipython-input-57-8d53e24db927> in <module>()
----> 1 s - s.max()
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/series.pyc in wrapper(self, other)
78
79 if (com.is_datetime64_dtype(self) and
---> 80 com.is_datetime64_dtype(other)):
81 lvalues = lvalues.view('i8')
82 rvalues = rvalues.view('i8')
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/common.pyc in is_datetime64_dtype(arr_or_dtype)
1003 tipo = arr_or_dtype.type
1004 else:
-> 1005 tipo = arr_or_dtype.dtype.type
1006 return issubclass(tipo, np.datetime64)
1007
AttributeError: 'Timestamp' object has no attribute 'dtype'
This code is in a gist for easy reference.
https://gist.github.com/hernamesbarbara/5061972
Thanks for any help or suggestions; it is much appreciated.
-Austin
If you look at the title of the page (top of your browser window) you are linking to, you can see that it's the development version of pandas:http://pandas.pydata.org/pandas-docs/dev/timeseries.html#time-deltas
So, today, that's for version
'0.11.0.dev-13ae597'
where this code is working fine.
The docs for the stable version are here:
http://pandas.pydata.org/pandas-docs/stable/
where you will see in at the top of the browser window
pandas 0.10.1
which is your version.
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