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Re: How to iterate on a changing dictionary

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On 06/20/11 00:32, TheSaint wrote:
> Hello
> 
> Trying to pop some key from a dict while is iterating over it will cause an 
> exception.
> How I can remove items when the search result is true.
> 
> Example:
> 
> while len(dict):
>    for key in dict.keys():
>       if dict[key] is not my_result:
>          dict.pop(key)
>     else:
>        condition_to_break
> print('Dictionary is over')


Others has described how to do what you wanted to do, but let's address
the main problem here, why are you iterating a dictionary?

I found that most of the time that I thought I needed to iterate through
a dictionary, it's really because I'm thinking the wrong way, and a
little bit more thought lead me to a better way that doesn't involve
iterating on the dictionary.

While there are legitimate reasons for iterating a dictionary, I'd
consider the alternatives first.

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Thread

How to iterate on a changing dictionary TheSaint <nobody@nowhere.net.no> - 2011-06-19 22:32 +0800
  Re: How to iterate on a changing dictionary Chris Angelico <rosuav@gmail.com> - 2011-06-20 01:13 +1000
    Re: How to iterate on a changing dictionary Roy Smith <roy@panix.com> - 2011-06-19 11:53 -0400
      Re: How to iterate on a changing dictionary Terry Reedy <tjreedy@udel.edu> - 2011-06-19 12:51 -0400
  Re: How to iterate on a changing dictionary Terry Reedy <tjreedy@udel.edu> - 2011-06-19 12:02 -0400
  Re: How to iterate on a changing dictionary Lie Ryan <lie.1296@gmail.com> - 2011-06-20 03:00 +1000
    Re: How to iterate on a changing dictionary TheSaint <nobody@nowhere.net.no> - 2011-06-20 21:20 +0800
      Re: How to iterate on a changing dictionary Florencio Cano <florencio.cano@gmail.com> - 2011-06-20 16:30 +0200
      Re: How to iterate on a changing dictionary Terry Reedy <tjreedy@udel.edu> - 2011-06-20 13:37 -0400
        Re: How to iterate on a changing dictionary TheSaint <nobody@nowhere.net.no> - 2011-06-21 18:44 +0800

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