python分割文件的常用方法

[global]
#原文件存放目录
dir1=F:\work\python\3595\pyserver\test
#新文件存放目录
dir2=F:\work\python\3595\pyserver\test1

#!/usr/bin/python
# -*- coding: utf-8 -*-
import os,sys,ConfigParser
class file_openate(object):
def __init__(self):
    #初如化读取数据库配置
    dir_config = ConfigParser.ConfigParser()
    file_config=open('config.ini',"rb")
    dir_config.readfp(file_config)
    self.dir1=str(dir_config.get("global","dir1"))
    self.dir1=unicode(self.dir1,'utf8')
    self.dir2=str(dir_config.get("global","dir2"))
    self.dir2=unicode(self.dir2,'utf8')
    file_config.close()
#print self.dir2
#self.dir1="F:\\work\\python\\3595\\pyserver\\test"
def file_list(self):
    input_name_han="软件有不确认性,前期使用最好先备份,以免发生数据丢失,确认备份后,请输入要分割的字节大小,按b来计算".decode('utf-8')
    print input_name_han
    while 1:
input_name=raw_input("number:")
if input_name.isdigit():
    input_name=int(input_name)
    os.chdir(self.dir1)
    for filename in os.listdir(self.dir1):
os.chdir(self.dir1)
#print filename
name, ext = os.path.splitext(filename)
file_size=int(os.path.getsize(filename))
f=open(filename,'r')
chu_nmuber=0
while file_size >= 1:
    #print file_size
    chu_nmuber=chu_nmuber + 1
    if file_size >= input_name:
file_size=file_size - input_name
a=f.read(input_name)
os.chdir(self.dir2)
filename1=name + '-' + str(chu_nmuber) + ext
new_f=open(filename1,'a')
new_f.write(a)
new_f.close()
#print file_size
    else:
a=f.read()
os.chdir(self.dir2)
filename1=name + '-' + str(chu_nmuber) + ext
new_f=open(filename1,'a')
new_f.write(a)
new_f.close()
break
print "分割成功".decode('utf-8') + filename
f.close()
else:
    print "请输入正确的数字,请重新输入".decode('utf-8')
file_name=file_openate()
file_name.file_list()

#!/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()