Consider the following example:
import pandas foo = pandas.Series( [ 0, 1, 2, 0 ] ) w = foo > 0 bar = foo[ w ].map( str ) print bar foo[w] = bar print foo foo[w] = bar print foo
gives the following output
1 1
2 2
dtype: object
0 0
1 NaN
2 1
3 0
dtype: object
0 0
1 1
2 2
3 0
dtype: object
It looks as if in the first assignemend foo[w] = bar the matching index of both sides is ignored.
Is this a bug or documented behavior?
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