Dictionary assignment with loc with existing index doesn't properly match column names in dict · Issue #9874 · pandas-dev/pandas (original) (raw)

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Description

uses the example DataFrame from #9857.

In [3]: df = pd.DataFrame({'x': [1,2,6], 'y': [2,2,8], 'z':[-5,0,5]})

In [4]: df = df.set_index('z')

In [5]: rhs = {'x': 9, 'y': 99}

In [6]: df.loc[5] Out[6]: x 6 y 8 Name: 5, dtype: int64

In [7]: df.loc[5] = rhs

In [8]: df Out[8]: x y z -5 1 2 0 2 2 5 {u'y': 99, u'x': 9} {u'y': 99, u'x': 9}