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

[tripsvt at gmail.com]

On Wednesday, October 2, 2013 10:01:16 AM UTC-7, tri... at 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:
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>     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}]
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> I want to round off all the values to two decimal points using the ceil function. Here's what I have:
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>     def roundingVals_toTwoDeci():
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>         global y
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>         for d in y:
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>             for k, v in d.items():
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>                 v = ceil(v*100)/100.0
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>         return
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>     roundingVals_toTwoDeci()
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> But it is not working - I am still getting the old values.
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I am not sure what's going on but here's the current scenario: I get the values with 2 decimal places as I originally required. When I do json.dumps(), it works fine. The goal is to send them to a URL and so I do a urlencode. When I decode the urlencoded string, it gives me the same goodold 2 decimal places. But, for some reason, at the URL, when I check, it no longer limits the values to 2 decimal places, but shows values like 9.10003677694312. What's going on. Here's the code that I have:

class LessPrecise(float):
    def __repr__(self):
        return str(self)

def roundingVals_toTwoDeci(y):
    for d in y:
        for k, v in d.iteritems():
            d[k] = LessPrecise(round(v, 2))
        return
            
roundingVals_toTwoDeci(y)
j = json.dumps(y)
print j

//At this point, print j gives me 

[{"a": 80.0, "b": 0.0, "c": 10.0, "d": 10.0}, {"a": 100.0, "b": 0.0, "c": 0.0, "d": 0.0}, {"a":  
80.0, "b": 0.0, "c": 10.0, "d": 10.0}, {"a": 90.0, "b": 0.0, "c": 0.0, "d": 10.0}]

//then I do, 
params = urllib.urlencode({'thekey': j}) 

//I then decode params and print it and it gives me

thekey=[{"a": 80.0, "b": 0.0, "c": 10.0, "d": 10.0}, {"a": 100.0, "b": 0.0, "c": 0.0, "d": 
0.0}, {"a": 80.0, "b": 0.0, "c": 10.0, "d": 10.0}, {"a": 90.0, "b": 0.0, "c": 0.0, "d": 10.0}]

However, at the URL, the values show up as 90.000043278694123