根据 dtype 选择列

select_dtypes 方法可用于根据 dtype 选择列。

In [1]: df = pd.DataFrame({'A': [1, 2, 3], 'B': [1.0, 2.0, 3.0], 'C': ['a', 'b', 'c'], 
                           'D': [True, False, True]})

In [2]: df
Out[2]: 
   A    B  C      D
0  1  1.0  a   True
1  2  2.0  b  False
2  3  3.0  c   True

使用 include 和 exclude 参数，你可以指定所需的类型：

# Select numbers
In [3]: df.select_dtypes(include=['number'])  # You need to use a list
Out[3]:
   A    B
0  1  1.0
1  2  2.0
2  3  3.0    

# Select numbers and booleans
In [4]: df.select_dtypes(include=['number', 'bool'])
Out[4]:
   A    B      D
0  1  1.0   True
1  2  2.0  False
2  3  3.0   True

# Select numbers and booleans but exclude int64
In [5]: df.select_dtypes(include=['number', 'bool'], exclude=['int64'])
Out[5]:
     B      D
0  1.0   True
1  2.0  False
2  3.0   True