In [12]: import pandas as pd
In [13]: pd.__version__
Out[13]: u'0.17.1'
In [14]: ser = pd.Series([pd.Timestamp('2012/01/01', tz='UTC')])
In [15]: ser2 = ser.copy(deep=True)
In [18]: ser2[0] = pd.Timestamp('1999/01/01', tz='UTC')
# unexpected mutation
In [19]: ser
Out[19]:
0 1999-01-01 00:00:00+00:00
dtype: datetime64[ns, UTC]
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