Python implements automatic backup of reading, rewriting, overwriting and rewriting of operating documents.

# coding:utf-8import time # time formatting and operation of backup files suspended using import shutil # as file backup # description of requirements # requirements: # 1, document path name can be entered; # 2, text wrapping input; # 3, text auto-save; # 4, readable text # 5, override rewrite # 6. If you overwrite, back up the previous files. " # define the 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" 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) # wrap each time you enter while read_flag = = 1: print "the value you entered has been saved And choose whether to print to view? \ nAnykey "print" means to view! \ nenter Q or Q but do not view it, 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 confirm to exit editing Please enter Q or Q to exit! \ n "\" any key, it means to accept the continued 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 whether read operation continue # continue circular write operation # define rewrite document function def cover_write (text_url): flag_write = 1 print "is backing up the original file, backing up the file with system time and .bak as backup file! \ n "# reference time module to format system time # shutil.copy the first parameter is the original file path, and 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. As the backup time of the original file.\ n "time.sleep (2) print" now you can rewrite your file.\ 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 to enter? \ n "\" any key will continue 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 "currently your 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 "for example: e:\ Users\ Administrator\ Desktop\ test.txt" print "Please enter:\ n" text_url = raw_input () print "\ n" print "*" * 20, "document content display begins" "*" * 20 # call the document view function read_text (text_url) # print spaces to separate print'\ n'# print 50 spaces from the document content * Also for the delimiter to use print'- * -'* 10, "enter the main program", "- * -" * 10 print "need to continue to add new content? \ n "\" any key means to continue entering\ n "\" enter quit, then quit! \ n "\" enter cover, then overwrite the full text and rewrite! The system will automatically back up old documents, please proceed with caution! " 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)