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

[Prasad, Ramit]

> > 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

Less efficiently, but maybe more useful if you need to check
against sOtherFeatures you can do the following.

D = [value for key, value in prog.items() if key in sOtherFeatures 
          or key in sCommonFeatures] # Python 3.x syntax


Ramit


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

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