Python pandas dataframe group by based on a condition

Try this code:

df.groupby('column').filter(lambda group: group.size > X)

The grouped result is a regular DataFrame, so just filter the results as usual:

 import pandas as pd

 df = pd.DataFrame({'a': ['a', 'b', 'a', 'a', 'b', 'c', 'd']})
 after = df.groupby('a').size()
 >> after
 a
 a    3
 b    2
 c    1
 d    1
 dtype: int64

 >> after[after > 2]
 a
 a    3
 dtype: int64