Python实现逐行分割大txt文件的方法介绍

# -*- 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')

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()

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

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