小编gio*_*c88的帖子

说我有一个数据框

import numpy as np
import pandas as pd

df = pd.DataFrame(np.random.randint(10, size=(10,3)), columns=['a', 'b', 'c'])

如果我现在尝试使用以下query方法查询它：

这有效：

df.query('''a > 3 and b < 9''')

这会引发错误：

df.query(
    '''
        a > 3 and
        b < 9
    '''
)

我尝试了多行字符串的许多变体，但结果总是以下错误：

~/ven/lib/python3.6/site-packages/pandas/core/computation/eval.py in eval(expr, parser, engine, truediv, local_dict, global_dict, resolvers, level, target, inplace)
    306     if multi_line and target is None:
    307         raise ValueError(
--> 308             "multi-line expressions are only valid in the "
    309             "context of data, use DataFrame.eval"
    310         ) …