[Python-ideas] If branch merging

[Stefan Behnel]

Cory Beutler schrieb am 07.06.2015 um 05:03:
> *Examples of use:*
> *Duplicate code in if-chains may be reduced:*
> # Old Version
> if a == b:
>     print ('a == b')
>     foo()             # <-- duplicate code
> elif b == c:
>     print ('b == c')
>     foo()             # <-- duplicate code
> elif c == d:
>     print ('c == d')
>     foo()             # <-- duplicate code
> 
> # New Version
> if a == b:
>     print ('a == b')
> elif b == c:
>     print ('b == c')
> elif c == d:
>     print ('c == d')
> also:
>     foo()            # <-- No longer duplicated

I think this is best done by extracting it into a function, e.g.

    def good_name_needed():
        if a == b:
            print('a == b')
        elif b == c:
            print('b == c')
        elif c == d:
            print('c == d')
        else:
            # nothing to do here
            return
        foo()            # <-- No longer duplicated

Usually, in real code, the call to foo() will have some kind of relation to
the previous if-chain anyway, so a good name for the whole function
shouldn't be all to difficult to find.

Stefan