[Tutor] Program gets stuck after a creating a list from dictinary items!

[Prasad, Ramit]

Please do not top post.

> 
> BTW I changed it to:
> D=[prog[key1] for key1 in list(sCommonFeatures)]
> 
> because sCommonFeatures is actually a set, but it still has the smae problem
> On Fri, Jul 6, 2012 at 12:27 PM, Ali Torkamani <torkamani at gmail.com> wrote:
> Thanks, I checked,  FD is not empty,
> Thanks for reminding about the flush and close, but I think some thing is
> wrong with:
> 
> D=[prog[key1] for key1 in sCommonFeatures]
> In the debug mode it works fine from the command line, but in the for loop it
> gets stuck.

I believe that the usage of 'in <blah>' converts it into a set (or 
set-like) object so probably that is the same as set(list(set())).

Again what do you mean by "stuck"? Does it error or do you just wait? 
Can you provide a small sample script (including sample sCommonFeatures and FD) ?
What version of Python / operating system?

> I could resolve it by defining a small function:
> 
> def getValue(mydict,keys):
>     A=[];
>     for i in keys:
>         A=A+[mydict[i]]
>     return A
> 
> and then calling it: D=getValue(prog,sCommonFeatures);
> (instead of D=[prog[key1] for key1 in list(sCommonFeatures)];)
> 
> but I'm still surprised why the latter one didn't work!

It would be more efficient to do the following

def getValue(mydict, keys):
    A=[]
    for i in keys:
        A.append( mydict[i] )
    return A


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423

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