python实现大文本文件分割

 #coding:gbk import os,sys,shutil  is_file_exits=False while not is_file_exits:  files_list=[]  if(len(sys.argv)==1):   print('请输入要切割的文件完整路径:')   files_path=raw_input().strip()   for str_file_path in files_path.split(' '):    if(str_file_path.strip()==''):     continue    if(not os.path.exists(str_file_path.strip())):     print(str_file_path.strip()+'文件路径不存在,请重新输入!')     is_file_exits=False     break    else:     files_list.append(str_file_path.strip());     is_file_exits=True  else:   for str_file_path in sys.argv[1:len(sys.argv)]:    if(str_file_path.strip()==''):     continue    if(not os.path.exists(str_file_path.strip())):     print(str_file_path.strip()+'文件路径不存在,请重新输入!')     is_file_exits=False     break    else:     files_list.append(str_file_path.strip());     is_file_exits=True  print('待切割文件:'+str(files_list))  is_continue=False while not is_continue:  print('请输入要切割的文件个数:')  str_files_count=raw_input()  if str_files_count.isdigit():   is_continue=True  else:   print('请输入正确的数字!')  for file_path in files_list:   split_file_path=''  total_lines_count=0  lines_count=0  files_count=int(str_files_count)   print('正在统计文本行数.....')   total_lines_count = len(open(file_path,'rU').readlines())  print('文本总行数:'+str(total_lines_count))   if files_count>total_lines_count:   print('文本太小,不值得分割!')   sys.exit()   (filepath,filename) = os.path.split(file_path);  (filepathname,extension) = os.path.splitext(file_path)   if os.path.exists(filepathname):   shutil.rmtree(filepathname)     os.mkdir(filepathname)     lines_count=int(total_lines_count/files_count)  mod_count=total_lines_count%files_count    print('正在进行文件分割.....')   line_num=0  file_num=0  temp=-1   for line in open(file_path,'rU').readlines():   if file_num<mod_count:    file_num=int(line_num/(lines_count+1))   else:    file_num=int((line_num-mod_count*(lines_count+1))/lines_count+mod_count)      split_file_path=filepathname+'/'+str.replace(filename,extension,'_'+str(file_num)+extension)    with open(split_file_path,'a+') as split_file:    split_file.write(line)    if temp!=file_num:    print('正在生成:'+split_file_path)   temp=file_num    line_num+=1   print(file_path+'分割完成!')   split_file.close()   os.system('pause')