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Groups > comp.lang.python > #37440

Re: Increase value in hash table

References <32d316a1-8551-4cb2-871f-b0a653c7d2f6@u7g2000yqg.googlegroups.com>
Date 2013-01-23 10:12 +0000
Subject Re: Increase value in hash table
From Oscar Benjamin <oscar.j.benjamin@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.881.1358935947.2939.python-list@python.org> (permalink)

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On 23 January 2013 07:26, moonhkt <moonhkt@gmail.com> wrote:
> Hi Al
>
> I have Data file have below
>
> Data file
> V1
> V2
> V3
> V4
> V4
> V3
>
> How to using count number of data ?
>
> Output
> V1 = 1
> V2 = 1
> V3 =2
> V4 = 2
>
>
>
> # Global Veriable
> printque = {}
> in def have below
>
> printque[val] =  printque[val] + 1
>
> I have below error
>   File "xprintlogchk.py", line 78, in chklog
>     printque[val] =  printque[val] + 1
> KeyError: 'nan'

You can't retrieve the value of printque[val] if you haven't yet added
an entry with the key val to the dict. Try this:

if val not in printque:
    printque[val] = 1
else:
    printque[val] = printque[val] + 1


Oscar

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Thread

Increase value in hash table moonhkt <moonhkt@gmail.com> - 2013-01-22 23:26 -0800
  Re: Increase value in hash table Chris Rebert <clp2@rebertia.com> - 2013-01-22 23:34 -0800
    Re: Increase value in hash table moonhkt <moonhkt@gmail.com> - 2013-01-23 01:23 -0800
  Re: Increase value in hash table Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-01-23 10:12 +0000
    Re: Increase value in hash table Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-01-23 10:47 +0000
      Multiple postings [was Re: Increase value in hash table] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-01-23 21:54 +1100
        Re: Multiple postings [was Re: Increase value in hash table] rusi <rustompmody@gmail.com> - 2013-01-23 06:00 -0800
    Re: Increase value in hash table Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-01-23 10:46 +0000
    Re: Increase value in hash table Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-01-23 10:46 +0000
    Re: Increase value in hash table Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-01-23 10:47 +0000
  Re: Increase value in hash table moonhk <moonhkt@gmail.com> - 2013-01-23 23:33 +0800
    Re: Increase value in hash table moonhkt <moonhkt@gmail.com> - 2013-01-23 07:39 -0800
      Re: Increase value in hash table Dave Angel <d@davea.name> - 2013-01-23 17:35 -0500
  Re: Increase value in hash table Vito De Tullio <vito.detullio@gmail.com> - 2013-01-24 19:30 +0100

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