1 # -*- coding:utf-8 -*- 2  3 from sys import argv 4  5 script, filename = argv  #解包变量参数 6  7 print ("we're going to erase %r." % filename) 8 print ("if you don't want that, hit CTRL-C(^c).")   #CTRL-C的用法 9 print ("if you  do want that, hit RETURN.")   # RETURN的用法10 11 input ("?")12 13 print ("opening the file...")14 target = open(filename, 'w')  #'w'的意识是‘write’，不可写成大写，否则出现语法错误。本句为定义变量target15 16 # 学会该如何打开一个其它文件目录的文件？？？？？17 #'r'       open for reading (default)18 #'w'       open for writing, truncating the file first 'x'   create a new file and open it for writing19 #'a'       open for writing, appending to the end of the file if it exists20 #'b'       binary mode 二进制21 #'t'       text mode (default) 文本模式22 #'+'       open a disk file for updating (reading and writing)23 #'U'       universal newline mode (deprecated)   24 25 print ("truncating the file .Goodbye!")26 #target.truncate()     #truncate()的意思是清空文件27 28 print ("Now I'm going to ask you for three lines.")29 30 line1 = input ("line 1: ")31 line2 = input ("line 2: ")32 line3 = input ("line 3: ")33 34 print ("I'm going to write these to the file.")35 36 target.write(line1) #write()的意思是写入文件37 target.write("\n")38 target.write(line2)39 target.write("\n")40 target.write(line3)41 target.write("\n")42 43 print ("And finally,we close it.")44 target.close() # 关闭文件和保存的意思