Aviv Palivoda added the comment:
I have two use cases for this feature:
1.
struct a {
int a;
#ifdef VER2
unsigned int b;
#endif
}
Now I may do:
>>> ver1 = Struct("i")
>>> ver2 = ver1 + Struct("I")
2.
struct a {
int a;
union inner {
int b;
unsigned int c;
} u;
}
As you can see with this feature I may do:
>>> start = Struct("i")
>>> union_b = Struct("i")
>>> union_c = Struct("I")
>>> version_a = start + union_b
>>> version_b = start + union_c
If you have a big struct with many options in the union this save's copying the
initial format.
> As for the concrete implementation, it looks to me that Struct('2L') +
> Struct('25B') results to Struct('2L5B').
I will fix the case when there is no format provided.
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<http://bugs.python.org/issue29903>
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