Re: Rounding off Values of dicts (in a list) to 2 decimal points

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From	Neil Cerutti <neilc@norwich.edu>
Newsgroups	comp.lang.python
Subject	Re: Rounding off Values of dicts (in a list) to 2 decimal points
Date	2 Oct 2013 17:32:14 GMT
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On 2013-10-02, tripsvt@gmail.com <tripsvt@gmail.com> wrote:
>  am trying to round off values in a dict to 2 decimal points
>  but have been unsuccessful so far. The input I have is like
>  this:
>
>     y = [{'a': 80.0, 'b': 0.0786235, 'c': 10.0, 'd': 10.6742903}, {'a': 80.73246, 'b': 0.0, 'c': 10.780323, 'd': 10.0}, {'a': 80.7239, 'b': 0.7823640, 'c': 10.0, 'd': 10.0}, {'a': 80.7802313217234, 'b': 0.0, 'c': 10.0, 'd': 10.9762304}]
>
> I want to round off all the values to two decimal points using
> the ceil function. Here's what I have:

I recommend using the builtin function round instead of
math.ceil. math.ceil doesn't do what is normally thought of as
rounding. In addition, it supports rounding to different numbers
of decimal places.

>     def roundingVals_toTwoDeci():
>         global y

You are hopefully* making modifications to y's object, but not rebinding y,
so you don't need this global statement.

>         for d in y:
>             for k, v in d.items():
>                 v = ceil(v*100)/100.0

[*] You're binding v to a new float object here, but not
modifying y. Thus, this code will have no effect on y.

You need to assign to y[k] here instead.

for k, v in d.items():
    y[k] = round(v, 2)

>         return

Bare returns are not usual at the end of Python functions. Just
let the function end; it returns None either way. Only return
when you've got an interesting value to return, or when you need
to end execution of the function early.

-- 
Neil Cerutti

Thread

Rounding off Values of dicts (in a list) to 2 decimal points tripsvt@gmail.com - 2013-10-02 10:01 -0700
  Re: Rounding off Values of dicts (in a list) to 2 decimal points Skip Montanaro <skip@pobox.com> - 2013-10-02 12:13 -0500
  Re: Rounding off Values of dicts (in a list) to 2 decimal points Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-10-02 20:22 +0300
  Re: Rounding off Values of dicts (in a list) to 2 decimal points Joel Goldstick <joel.goldstick@gmail.com> - 2013-10-02 13:19 -0400
  Re: Rounding off Values of dicts (in a list) to 2 decimal points Neil Cerutti <neilc@norwich.edu> - 2013-10-02 17:32 +0000
  Re: Rounding off Values of dicts (in a list) to 2 decimal points tripsvt@gmail.com - 2013-10-03 10:06 -0700
    Re: Rounding off Values of dicts (in a list) to 2 decimal points Peter Otten <__peter__@web.de> - 2013-10-03 19:41 +0200
    Re: Rounding off Values of dicts (in a list) to 2 decimal points Neil Cerutti <neilc@norwich.edu> - 2013-10-03 18:03 +0000
      Re: Rounding off Values of dicts (in a list) to 2 decimal points tripsvt@gmail.com - 2013-10-03 11:17 -0700

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