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pandas check if value in column is in a list

df_new[df_new['l_ext'].isin([31, 22, 30, 25, 64])]
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pandas check if series

type(x) is pd.DataFrame		# NO
type(x) == pd.DataFrame		# NO
isinstance(x, pd.DataFrame) # YES
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check if value is in series pandas

In [21]: s.unique()
Out[21]: array(['a', 'b', 'c'], dtype=object)

In [22]: 'a' in s.unique()
Out[22]: True
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