Python实现逐行分割大txt文件的方法介绍

代码如下所示：

# -*- coding: <encoding name> -*-
import io
LIMIT = 150000
file_count = 0
url_list = []
with io.open('D:DB_NEW_bakDB_NEW_20171009_bak.sql','r',encoding='utf-16') as f:
 for line in f:
 url_list.append(line)
 if len(url_list) < LIMIT:
 continue
 file_name = str(file_count)+".sql"
 with io.open(file_name,'w',encoding='utf-16') as file:
 for url in url_list[:-1]:
 file.write(url)
 file.write(url_list[-1].strip())
 url_list=[]
 file_count+=1
if url_list:
 file_name = str(file_count) + ".sql"
 with io.open(file_name,'w',encoding='utf-16') as file:
 for url in url_list:
 file.write(url)
print('done')

Python从txt文件中逐行读取数据

非常的简单，提供三种方法：

方法一：

f = open("foo.txt") # 返回一个文件对象 
line = f.readline() # 调用文件的 readline()方法 
while line: 
 print line, # 后面跟 ',' 将忽略换行符 
 # print(line, end = '')　　　# 在 Python 3中使用 
 line = f.readline() 
 
f.close()

方法二：

for line in open("foo.txt"): 
 print line,

方法三：

f = open("c:\1.txt","r") 
lines = f.readlines()#读取全部内容 
for line in lines 
 print line

总结