为什么Python pandas read_csv与其他函数结合使用时不起作用

问题描述 投票:0回答:1

Python pandas read_csv在单独写入时提供正确的输出:

import pandas as pd
def bgp_neighbor_status():
    data = pd.read_csv('E:\\Python-Scripts\\bgp-result.txt', delim_whitespace=True, header=None)
    for index, row in data.iterrows():
        if row[9] == 'Down' or row[9] == 'Idle' or row[9] == 'Active':
            print(f"Neighbor {row[0]} is down")
        else:
            pass

bgp_neighbor_status()

显示预期的输出:

Neighbor 10.0.11.101 is down

但是,当我将相同的函数与这样的另一个函数组合时,我收到错误: - pandas.errors.EmptyDataError:没有要从文件解析的列

from __future__ import print_function
from netmiko import ConnectHandler
import pandas as pd

import sys
import time
import select
import paramiko
import re

bgp_result_file = open(r'E:\\Python-Scripts\\bgp-result.txt','w')
old_stdout = sys.stdout
sys.stdout = bgp_result_file
platform = 'cisco_ios'
username = 'javed'
password = 'cisco'

ip_add_file = open(r'E:\\Python-Scripts\\IPAddressList.txt', 'r')

def check_bgp(ip_add_file):

    for host in ip_add_file:
        host = host.rstrip('\n')
        connect = ConnectHandler(device_type=platform, ip=host, username=username, password=password)
        output = connect.send_command('terminal length 0')
        output = connect.send_command('enable')
        bgp_status = connect.send_command('show ip bgp summary | be N')
        print (bgp_status)


def bgp_neighbor_status():
    data = pd.read_csv('E:\\Python-Scripts\\bgp-result.txt', delim_whitespace=True, header=None)
    for index, row in data.iterrows():
        if row[9] == 'Down' or row[9] == 'Idle' or row[9] == 'Active':
            print(f"Neighbor {row[0]} is down")
        else:
            pass

check_bgp(ip_add_file)
bgp_neighbor_status()  
python python-3.x pandas
1个回答
1
投票

这一行就在这里:

bgp_result_file = open(r'E:\\Python-Scripts\\bgp-result.txt','w')

该行在脚本开始时执行,基本上清除了该文件。从文档:https://docs.python.org/2/library/functions.html#open

最常用的模式值是'r'用于读取,'w'用于写入(截断文件,如果它已经存在),'a'用于追加(在某些Unix系统上,这意味着所有写入都附加到结尾)无论当前的搜索位置如何,都是文件的。 [...]

截断文件(如果已存在)。

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