python - Getting proportion of each of one variable that is True for another in 'pandas' -


i have dataframe in pandas includes column 'a' , boolean-valued column 'b' , find values of 'a' @ least number, n, of rows have true 'b'.

the closest thing can com 

df.query('b == true')['a'].value_counts()

and @ numbers see ones greater than, n.

is there more pythonic (or more ailuropodian) way of doing (perhaps approach returns count greater n, or proportions true)?

this sounds similar filter:

in [11]: df = pd.dataframe([[1, true], [1, true], [2, false], [2, true]], columns=['a', 'b'])  in [12]: g = df.groupby('a')  in [13]: g.filter(lambda x: x['b'].sum() > 1) out[13]:         b 0  1  true 1  1  true

to find values of true use sum agg method:

in [21]: res = g.b.sum() > 1  in [22]: res[res] out[22]:  1    true name: b, dtype: bool  in [23]: res[res].index out[23]: int64index([1], dtype='int64')

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