匹配文本并在其上一行追加文本
问题描述
Python匹配文本并在其上一行追加文本
test.txt
a b c d e
1.读进列表后覆盖原文件
def match_then_insert(filename, match, content):
? ? """匹配后在该行追加
? ? :param filename: 要操作的文件
? ? :param match: 匹配内容
? ? :param content: 追加内容
? ? """
? ? lines = open(filename).read().splitlines()
? ? index = lines.index(match)
? ? lines.insert(index, content)
? ? open(filename, mode='w').write('\n'.join(lines))
match_then_insert('test.txt', match='c', content='123')
效果
a b 123 c d e
2.FileInput类
from fileinput import FileInput
def match_then_insert(filename, match, content):
? ? """匹配后在该行追加
? ? :param filename: 要操作的文件
? ? :param match: 匹配内容
? ? :param content: 追加内容
? ? """
? ? for line in FileInput(filename, inplace=True): ?# 原地过滤
? ? ? ? if match in line:
? ? ? ? ? ? line = content + '\n' + line
? ? ? ? print(line, end='') ?# 输出重定向到原文件
match_then_insert('test.txt', match='c', content='123')
3.seek
def match_then_insert(filename, match, content):
? ? """匹配后在该行追加
? ? :param filename: 要操作的文件
? ? :param match: 匹配内容
? ? :param content: 追加内容
? ? """
? ? with open(filename, mode='rb+') as f:
? ? ? ? while True:
? ? ? ? ? ? try:
? ? ? ? ? ? ? ? line = f.readline() ?# 逐行读取
? ? ? ? ? ? except IndexError: ?# 超出范围则退出
? ? ? ? ? ? ? ? break
? ? ? ? ? ? line_str = line.decode().splitlines()[0]
? ? ? ? ? ? if line_str == match:
? ? ? ? ? ? ? ? f.seek(-len(line), 1) ?# 光标移动到上一行
? ? ? ? ? ? ? ? rest = f.read() ?# 读取余下内容
? ? ? ? ? ? ? ? f.seek(-len(rest), 1) ?# 光标移动回原位置
? ? ? ? ? ? ? ? f.truncate() ?# 删除余下内容
? ? ? ? ? ? ? ? content = content + '\n'
? ? ? ? ? ? ? ? f.write(content.encode()) ?# 插入指定内容
? ? ? ? ? ? ? ? f.write(rest) ?# 还原余下内容
? ? ? ? ? ? ? ? break
match_then_insert('test.txt', match='c', content='123')
对比 方案 耗时/s 读进列表后覆盖原文件 54.42 FileInput类 121.59 seek 3.53
from timeit import timeit
from fileinput import FileInput
def init_txt():
open('test.txt', mode='w').write('\n'.join(['a', 'b', 'c', 'd', 'e']))
def f1(filename='test.txt', match='c', content='123'):
lines = open(filename).read().splitlines()
index = lines.index(match)
lines.insert(index, content)
open(filename, mode='w').write('\n'.join(lines))
def f2(filename='test.txt', match='c', content='123'):
for line in FileInput(filename, inplace=True):
if match in line:
line = content + '\n' + line
print(line, end='')
def f3(filename='test.txt', match='c', content='123'):
with open(filename, mode='rb+') as f:
while True:
try:
line = f.readline()
except IndexError:
break
line_str = line.decode().splitlines()[0]
if line_str == match:
f.seek(-len(line), 1)
rest = f.read()
f.seek(-len(rest), 1)
f.truncate()
content = content + '\n'
f.write(content.encode())
f.write(rest)
break
init_txt()
print(timeit(f1, number=1000))
init_txt()
print(timeit(f2, number=1000))
init_txt()
print(timeit(f3, number=1000))
遇到的坑
报错可试试在文件头部添加
# -*- coding: utf-8 -*-
或指定 encoding='utf-8'
用正则表达式匹配文本(Python经典编程案例)
ceshi.txt文本如下：第一行为空行
爬虫任务报警 01:45:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-1 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: ah_sina_com_cn,job: 28395818dbcb11e998a3f632d94e247c,pid: 88971,log: data/logs/chinabond_fast_spider/ah_sina_com_cn/28395818dbcb11e998a3f632d94e247c.log,items: None error_data: 爬虫任务报警 01:45:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-6 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: shupeidian_bjx_com_cn,job: 04738a5cdbcb11e9803172286b76aa73,pid: 34246,log: data/logs/chinabond_fast_spider/shupeidian_bjx_com_cn/04738a5cdbcb11e9803172286b76aa73.log,items: None error_data: 爬虫任务报警 01:45:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-6 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: news_sdchina_com,job: 28e8db4edbcb11e9803172286b76aa73,pid: 34324,log: data/logs/chinabond_fast_spider/news_sdchina_com/28e8db4edbcb11e9803172286b76aa73.log,items: None error_data: 爬虫任务报警 01:47:20 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-0 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: hq_smm_cn,job: 4bdc3af6dbcb11e9a45522b8c8b2a9e4,pid: 111593,log: data/logs/chinabond_fast_spider/hq_smm_cn/4bdc3af6dbcb11e9a45522b8c8b2a9e4.log,items: None error_data: 爬虫任务报警 01:47:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-6 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: sichuan_scol_com_cn,job: 71321c4edbcb11e9803172286b76aa73,pid: 34461,log: data/logs/chinabond_fast_spider/sichuan_scol_com_cn/71321c4edbcb11e9803172286b76aa73.log,items: None error_data: 爬虫任务报警 01:47:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-2 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: www_mof_gov_cn,job: 7418dacedbcb11e9b15e02034af50b6e,pid: 65326,log: data/logs/chinabond_fast_spider/www_mof_gov_cn/7418dacedbcb11e9b15e02034af50b6e.log,items: None error_data: 爬虫任务报警 01:47:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-5 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: www_funxun_com,job: 4dcda7a0dbcb11e980a8862f09ca6d70,pid: 27785,log: data/logs/chinabond_fast_spider/www_funxun_com/4dcda7a0dbcb11e980a8862f09ca6d70.log,items: None error_data: 爬虫任务报警 01:49:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-4 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: shuidian_bjx_com_cn,job: 95090682dbcb11e9a0fade28e59e3773,pid: 106424,log: data/logs/chinabond_fast_spider/shuidian_bjx_com_cn/95090682dbcb11e9a0fade28e59e3773.log,items: None error_data: 爬虫任务报警 01:51:20 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-0 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: tech_sina_com_cn,job: de4bdf72dbcb11e9a45522b8c8b2a9e4,pid: 111685,log: data/logs/chinabond_fast_spider/tech_sina_com_cn/de4bdf72dbcb11e9a45522b8c8b2a9e4.log,items: None error_data: 爬虫任务报警 01:51:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-6 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: ee_ofweek_com,job: ff6bd5b8dbcb11e9803172286b76aa73,pid: 34626,log: data/logs/chinabond_fast_spider/ee_ofweek_com/ff6bd5b8dbcb11e9803172286b76aa73.log,items: None error_data: 爬虫任务报警 01:51:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-6 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: house_hexun_com,job: ff6dfdacdbcb11e9803172286b76aa73,pid: 34633,log: data/logs/chinabond_fast_spider/house_hexun_com/ff6dfdacdbcb11e9803172286b76aa73.log,items: None error_data: 爬虫任务报警 01:51:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-2 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: www_sjfzxm_com,job: 018e7d78dbcc11e9b15e02034af50b6e,pid: 65492,log: data/logs/chinabond_fast_spider/www_sjfzxm_com/018e7d78dbcc11e9b15e02034af50b6e.log,items: None error_data: 爬虫任务报警 01:53:21 scrapyd==》爬虫任务异常死亡报警 hostname: scrapyd-chinabond-4 error_count: Process died: exitstatus=None ,project: chinabond_fast_spider,spider: news_xianzhaiwang_cn,job: 48d835e8dbcc11e9a0fade28e59e3773,pid: 106476,log: data/logs/chinabond_fast_spider/news_xianzhaiwang_cn/48d835e8dbcc11e9a0fade28e59e3773.log,items: None error_data:
代码如下：
import os
import re
import json
from collections import namedtuple
alert = namedtuple('Spider_Alert', 'alert_time, alert_hostname, alert_project, alert_spider')
path = r'D:\data\ceshi.txt'
g_path = r'D:\data\\'
file_name = r'result.txt'
file_path = g_path + file_name
alerts_list = list()
with open(path, encoding="utf-8") as file:
lines = file.readlines() # 读取每一行
count = 0
time = None
hostname = None
project = None
for line in lines:
if re.search(r'^\d{2}:\d{2}:\d{2}\s*$', line):
time = re.search(r'^(\d{2}:\d{2}:\d{2})\s*$', line).group(1)
if re.search(r'^hostname:\s*(.+)', line):
hostname = re.search(r'^hostname:\s*(.+)', line).group(1)
if re.search(r'project:\s*([^,]+),', line):
project = re.search(r'project:\s*([^,]+),', line).group(1)
if re.search(r'spider:\s*([^,]+),', line):
spider = re.search(r'spider:\s*([^,]+),', line).group(1)
if re.search(r'^error_data', line):
spider_alert = None
spider_alert = alert(alert_time=time, alert_hostname=hostname, alert_project=project, alert_spider=spider)
alerts_list.append(spider_alert)
for element in alerts_list:
print(element[0], element[1], element[3])
with open(file_path, 'a', encoding="utf-8") as file:
file.write(element[0] + "\t" + element[1] + "\t" + element[3])
file.write(' \n')
执行结果如下图：
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
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