Richard D. Moores wrote:
> Please see my Python 3.1 code pasted at
> <http://python.pastebin.com/T3vm9vKT>.
>
> This does what I want, which is to do one of:
> 1. print all the elements of the list, lst.
> 2. print "Done" when "" is entered.
> 3. print the elements of lst whose indexes are entered.
> (sorry if all this is obvious)
>
> Now, the code works, but isn't there a better way to do what I want?
> I've been away from Python for a while, and have gotten rusty.
Although the code gets slightly more complex having a look at the cmd module
may be worthwhile. Once you have set up the bases you can add commands by
adding a do_xxx() method assuming 'xxx' is the name of the command. Tab
completion works (for commands) and you get a rudimentary help function for
free.
$ cat indexes.py
import cmd
class Cmd(cmd.Cmd):
prompt = "Enter a command -> "
def precmd(self, line):
if line.strip().isdigit():
# treat a lone integer as a shortcut
# for the 'one' command
return "one " + line
if not line:
return "EOF"
return line
def do_all(self, line):
"print all items"
for i, item in enumerate(items):
print_item(i)
def do_one(self, line):
i = int(line)
print_item(i)
def do_EOF(self, line):
print("That's all, folks")
return True
items = [100,101,102,103]
def print_item(i):
print(i, "->", items[i])
Cmd().cmdloop("Enter a command or type 'help' for help")
$ python3 indexes.py
Enter a command or type 'help' for help
Enter a command -> help
Documented commands (type help <topic>):
========================================
all
Undocumented commands:
======================
EOF help one
Enter a command -> one 1
1 -> 101
Enter a command -> help all
print all items
Enter a command -> all
0 -> 100
1 -> 101
2 -> 102
3 -> 103
Enter a command -> 3
3 -> 103
Enter a command ->
That's all, folks
$
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
