python实现按行分割文件

#!/usr/bin/env python
#--*-- coding:utf-8 --*--
 
import os
 
class SplitFiles():
 """按行分割文件"""
 
 def __init__(self, file_name, line_count=200):
 """初始化要分割的源文件名和分割后的文件行数"""
 self.file_name = file_name
 self.line_count = line_count
 
 def split_file(self):
 if self.file_name and os.path.exists(self.file_name):
 try:
 with open(self.file_name) as f : # 使用with读文件
  temp_count = 0
  temp_content = []
  part_num = 1
  for line in f:
  if temp_count < self.line_count:
  temp_count += 1
  else :
  self.write_file(part_num, temp_content)
  part_num += 1
  temp_count = 1
  temp_content = []
  temp_content.append(line)
  else : # 正常结束循环后将剩余的内容写入新文件中
  self.write_file(part_num, temp_content)
 
 except IOError as err:
 print(err)
 else:
 print("%s is not a validate file" % self.file_name)
 
 def get_part_file_name(self, part_num):
 """"获取分割后的文件名称：在源文件相同目录下建立临时文件夹temp_part_file，然后将分割后的文件放到该路径下"""
 temp_path = os.path.dirname(self.file_name) # 获取文件的路径（不含文件名）
 part_file_name = temp_path + "temp_part_file"
 if not os.path.exists(temp_path) : # 如果临时目录不存在则创建
 os.makedirs(temp_path)
 part_file_name += os.sep + "temp_file_" + str(part_num) + ".part"
 return part_file_name
 
 def write_file(self, part_num, *line_content):
 """将按行分割后的内容写入相应的分割文件中"""
 part_file_name = self.get_part_file_name(part_num)
 print(line_content)
 try :
 with open(part_file_name, "w") as part_file:
 part_file.writelines(line_content[0])
 except IOError as err:
 print(err)
 
if __name__ == "__main__":
 sf = SplitFiles(r"F:\multiple_thread_read_file.txt")
 sf.split_file()

#! /usr/bin/env python
# -*- coding: utf-8 -*-
 
LIMIT=1000
file_count=0
url_list=[]
 
with open("123.txt") as f:
 for line in f:
 url_list.append(line)
 if len(url_list)<LIMIT:
 continue
 #数据达到LIMIT
 file_name=str(file_count)+".txt"
 with open(file_name,'w') as file:
 for url in url_list[:-1]:
 #print(url)
 file.write(url)
 file.write(url_list[-1].strip())
 url_list=[]
 file_count+=1
if url_list:
 file_name=str(file_count)+".txt"
 with open(file_name,'w') as file:
 for url in url_list:
 file.write(url)
print('done')