How to determine whether a column/variable is numeric or not in Pandas/NumPy?

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In pandas 0.20.2 you can do:

import pandas as pd
from pandas.api.types import is_string_dtype
from pandas.api.types import is_numeric_dtype

df = pd.DataFrame({'A': ['a', 'b', 'c'], 'B': [1.0, 2.0, 3.0]})

is_string_dtype(df['A'])
>>>> True

is_numeric_dtype(df['B'])
>>>> True

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