Python implements read, resume, overwrite override automatic backup of operation document

# coding:utf-8import time   #  the time formatting and operation of the backup file is paused using import shutil    #  as a file backup using #  requirements description "" #  Requirements: #     1, can enter the document path name;#      2, text wrap input, #     3, text Auto-save, #     4, readable text #      5, overwriting overrides, #     6, overwriting overrides, backing up the previous file. "" "#  definition read document function Def read_text (text_url):     with open (text_url, " R ")  as read:        for i in read.readlines ():             print i         print  "*"  * 20, "End of document content display",  "*"  * 20#  definition of continued write document function def  continue_write (text_url):     write_flag = 1    read_ Flag = 1    while write_flag == 1:        print  "Please enter what you need to enter: \ n"          get_new_string = raw_input ()          with open (text_url,  "A +")  as write:             write.write ("\ n"  + get_new_string)   #  one line break for each input          while read_flag == 1:             print  "The value you entered is saved and you choose whether to print the view?" \ n "            print " any key, it means view! \ n Enter Q or Q do not view, continue to enter! \ n "            get_search_input_key =  Raw_input ()             if get_search_input_ key ==  "Q"  or get_search_input_key ==  "Q":                 continue_write (Text_url)                  read_flag = 0             else:                 Read_text (Text_url)                  read_flag = 0        print  "If you are sure you want to quit editing, please enter Q or Q to exit!" \ n "               " any key, it means accept continue input! \ n "        get_input_key = raw_input ()          if get_input_key ==  "Q"  or get_input_key ==  " Q ":             print  "GoodBye ..."              write_flag = 0         else:            read_flag = 1    #  can again determine if a read operation is required              continue    #  continue circular write operation #  definition rewrite document function def cover_write (text_url):     flag_write = 1    print  "Backing up the original files, backup files with system time and. Bak as backup files!" \ n "    #  reference time module to format the system times     # shutil.copy  The first parameter is the original file path, The second parameter is the backup file path     shutil.copy (text_url, text_url +  ".")  + time.strftime ("%y%m%d%h%m%s")  +  ". Bak")     print  "Please wait 2 seconds, Backup time as original file ... \ n "    time.sleep (2)   &Nbsp; print  "Now you can rewrite your files ... \ n"     print  "Please enter what you want to rewrite ... \ n"      get_input_string = raw_input ()     with open (text_url,  "W")   As cover:        cover.write (get_input_string)      while flag_write == 1:        print  " Would you like to continue typing? \ n "               " any key continues to enter, Enter Q or Q to exit the input! "        get_write_continue_key = raw_input ()          if get_write_continue_key ==  "Q"  or get_write_ continue_key ==  "Q":             flag_ write = 0        else:              continue_write (Text_url)              flag_write = 0    print  "Your current document content is: \ n"     read_ Text (TEXT_URL) #  System Main program entry if __name__ ==  "__main__":     print r " Please enter the path and name of the document you want to read. "    print r" Example: E:\Users\Administrator\Desktop\test.txt "    print   "Please enter: \ n"     text_url = raw_input ()     print  "\ n"     print  "*"  * 20,  "Document content display Start",  "*"  * 20     #  Call View Document function     read_text (text_url)     #  The space is printed to separate the contents of the document     print  ' \ n '     #  print 50 *, also for delimiter use      print  '-*-'  * 10,  "Go to Main program",  "-*-"  * 10     print  "Do I need to continue adding new content? \ n "         " any key means continue input \ n "           "Enter quit, then quit!" \ n "         " input cover, then overwrite the full text again! The system will automatically back up old documents, please do it carefully! "    is_continue_or_cover = raw_input ()     if is_ continue_or_cover ==  "Quit":        print  "GoodBye ..."     elif is_continue_or_cover ==  "Cover":         cover_write (Text_url)     else:         continue_write (text_url )

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Python implements read, resume, overwrite override automatic backup of operation document