[Tutor] Fwd: Sys.argv read parameters

[Danilo Chilene]

On Thu, Apr 18, 2013 at 2:52 PM, Alan Gauld <alan.gauld at btinternet.com>wrote:

> On 18/04/13 18:14, Danilo Chilene wrote:
>
>  for command in commands:
>>      if arg in commands:
>>          print commands[command]
>>      else:
>>          print 'Invalid command'
>>
>
> I don't understand what you are doing here? Its almost a random selection
> mechanism? You print the command for every item in commands if arg is in
> commands and Invalid Command for every command if its not?
> Whatever its trying to do its massively inefficient.
>
> I thought you'd have wanted something like
>
>  for command in commands:
>       if arg == command:
>
>           print commands[command]
>       else:
>           print 'Invalid command'
>
> Which is roughly equivalent to:
>
> print commands.get(arg, 'Invalid command')
>
> but much less efficient!

Hi Alan,

Yes, I was doing it the wrong way.


>
>
>
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
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