Inline Calculation of Dictionary Values

Dave Angel davea at ieee.org
Wed Apr 21 16:31:18 CEST 2010


++imanshu wrote:
> Hi,
>
>      Is it possible to something along these lines in python :-
>
> map = {
> 'key1': f(),
> 'key2': modify_state(); val = f(); restore_state(); val,
> 'key3': f(),
> }
>
>       For 'key2' I want to store the value returned by f() but after
> modifying the state. Do we have something like a "bare block". I am
> trying to avoid this :-
>
> def f2():
>      modify_state()
>      val = f()
>      restore_state()
>      return val
>
> map = {
> 'key1': f(),
> 'key2': f2()
> 'key3': f(),
> }
>
> Thank You,
> Himanshu
>
>   
How about something like:

mymap = {
'key1': f(),
'key2': [modify_state(), f(), restore_state()][1],
'key3': f(),
}

This builds a list of three values, and uses only the [1] item from the 
list.

DaveA



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