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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
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
df['C'] = df['A'] + df['B']
# ---------------------------------------------------------------------------
# TypeError Traceback (most recent call last)
# <ipython-input-65-7057e174d79e> 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')
s - s.max()
# ---------------------------------------------------------------------------
# AttributeError Traceback (most recent call last)
# <ipython-input-66-8d53e24db927> 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'
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