大熊猫Timedelta错误

从大熊猫的文件运行代码样本时遇到错误。大熊猫Timedelta错误

我怀疑这可能与我使用熊猫的版本，但我一直无法证实。

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

为做到这一点

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

这似乎是一致的：

pandas VERSION 0.10.1 
numpy VERSION 1.7.0 
scipy VERSION 0.12.0.dev-14b1e07

下面的例子是直接从大熊猫的文档在这里拍摄与期望根据文件编辑输出。

样品下一行代码会产生错误：

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')

数据类型：

df.dtypes 

Out[56]: 
A datetime64[ns] 
B   object

同样，我得到一个错误，当我做加法/减法：

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'

此代码是在以方便参考要旨。

https://gist.github.com/hernamesbarbara/5061972

感谢任何帮助或建议;非常感谢。

-Austin

来源

2013-03-01 hernamesbarbara