add ex16.py

ex16.py

@@ -0,0 +1,36 @@
+# --coding=utf-8--
+from sys import argv
+
+script, filename = argv
+
+print "We're going to erase %r." % filename
+print "If you don't want that, hit CTRL-C (^C)."
+print "If you do want that, hit RETURN."
+
+raw_input("?")
+
+print "Opening the file..."
+target = open(filename, 'w') #打开输入的文件并写入赋值给 target,新建只读方式打开
+
+print "Truncating the file. Goodbye!"
+target.truncate()
+
+print "Now I'm going to ask you for three lines."
+
+line1 = raw_input("line 1: ")
+line2 = raw_input("line 2: ")
+line3 = raw_input("line 3: ")
+
+print "I'm going to write these to the file."
+
+target.write(line1)
+target.write('\n')
+target.write(line2)
+target.write('\n')
+target.write(line3)
+target.write('\n')
+
+print "And finally, we close it."
+
+print target.read()
+target.close()