I messed up and used = instead of == in a query.
df = pd.DataFrame({'a': [1, 2, 3], 'b': ['a', 'b', 'c']})
df.query('a=1')
That raises a ValueError. But df was modified.
In [15]: df Out[15]: a b 0 1 a 1 1 b 2 1 c
versions:
pandas: 0.15.0-6-g403f38d
bottleneck: None
tables: None
numexpr: 2.3.1
Can't look right now.
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