如何删除数据帧中包含非浮点型/整型变量的行

import pandas as pd
import numpy as np

df = pd.DataFrame({'A': [1, 2, 3, 'a', 5],
                   'B': [1.1, 2.2, 'b', 4.4, 5.5],
                   'C': ['c', 2, 3, 4, 5],
                   'D': [1, 2, 3, 4, 5]})

mask = df.applymap(lambda x: isinstance(x, (float, int)))

rows_to_delete = df[~mask.all(axis=1)]

df = df.drop(rows_to_delete.index)

import pandas as pd
import numpy as np

df = pd.DataFrame({'A': [1, 2, 3, 'a', 5],
                   'B': [1.1, 2.2, 'b', 4.4, 5.5],
                   'C': ['c', 2, 3, 4, 5],
                   'D': [1, 2, 3, 4, 5]})

mask = df.applymap(lambda x: isinstance(x, (float, int)))
rows_to_delete = df[~mask.all(axis=1)]
df = df.drop(rows_to_delete.index)