On 03/19/2013 10:54 PM, Phil wrote:
Thank you for reading this.
>
> I'm working my way through a series of exercises where the author
only provides a few solutions.
>
> The reader is asked to modify the histogram example so that it uses
the get method thereby eliminating the if and else statements.
Histogram2 is my effort.
>
> The resulting dictionary only contains the default value provided by
"get" and I cannot see how the value can be incremented without an if
statement.
>
> def histogram(s):
> d = dict()
> for c in s:
> if c not in d:
> d[c] = 1
> else:
> d[c] += 1
> return d
>
> def histogram2(s):
> d = dict()
> for c in s:
> d[c]= d.get(c, 0)
>
> return d
>
> h = histogram("brontosaurs")
>
> print h
>
> print
>
> print "histogram2"
>
> h = histogram2("brontosaurs")
>
> print h
>
By the way, you can further simplify it by doing:
def histogram2(s):
return {c: d.get(c,0)+1 for c in s}
That will work in python 3, in python 2 you need:
return dict((c: d.get(c,0)+1) for c in s)
--
Lark's Tongue Guide to Python: http://lightbird.net/larks/
Those who can make you believe absurdities can make you commit
atrocities. Voltaire
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