为2列值Pandas应用loc

Question

我想找到一个包含2列参数的数据帧： 如果我paises_cpm = df.loc[a]工作正常，但如果我paises_cpm = df.loc[a,b]我收到错误：IndexingError: Unalignable boolean Series provided as indexer (index of the boolean Series and of the indexed object do not match

import pandas as pd
import time


fecha = time.strftime(str((int(time.strftime("%d")))-1))

subastas = int(fecha) * 5000
impresiones = int(fecha) * 1000

df = pd.read_csv('Cliente_x_Pais.csv')
a = df['Subastas'] > subastas
b = df['Impresiones_exchange'] > impresiones


paises_cpm = df.loc[a,b]

paises_cpm.to_csv('paises_cpm.csv', index=False)

Answer 1

您需要|的{​​{1}}或or &的链条件：

and

或者：

paises_cpm = df.loc[a | b]

可能有一行解决方案，但括号是必要的：

paises_cpm = df.loc[a & b]