From: brabuhr@...
Date: 2008-11-28T00:22:29+09:00
Subject: Re: Performance issues with large files -- ruby vs. python :

On Thu, Nov 27, 2008 at 9:39 AM, sa 125 <s_ayalon@hotmail.com> wrote:
> The core processing is done through if statements
>
> #...code below is in loop: for row in csv...
>
> if not @main_hash.keys.member?(date)
>  @main_hash[date] = {}
>  @main_hash[date][company] = {}
>  @main_hash[date][company][prod] = {}
>  @main_hash[date][company][prod] = row_values
> else
>  if not @main_hash[date].keys.member?(company)
>    @main_hash[date][company] = {}
>    @main_hash[date][company][prod] = {}
>    @main_hash[date][company][prod] = row_values
>  else
>    if not @main_hash[date][company].keys.member?(prod)
>      @main_hash[date][company][prod] = {}
>      @main_hash[date][company][prod] = row_values
>    end
>  end
> end
>
> # loop ends

unless main_hash[date]
  main_hash[date] = {}
  main_hash[date][company] = {}
  main_hash[date][company][prod] = row_values
else
  unless main_hash[date][company]
    main_hash[date][company] = {}
    main_hash[date][company][prod] = row_values
  else
    unless main_hash[date][company][prod]
      main_hash[date][company][prod] = row_values
    end
  end
end

main_hash[date] ||= {}
main_hash[date][company] ||= {}
main_hash[date][company][prod] ||= row_values

d = main_hash[date] ||= {}
c = d[company] ||= {}
p = c[prod] ||= row_values

((@main_hash[date] ||= {})[company] ||= {})[prod] ||= row_values