Reading PEP 340, it seems to me that blocks could be used for generating
nested data structures:
def blist(list):
def enter(parent=None):
if parent:
parent.append(self)
yield self
x = blist()
block x.enter() as x:
x.append(1)
block blist().enter(x) as x:
x.append(2)
x.append(3)
print x
this should print [1, [2], 3]
For this to work, the scope of the block variable has to end with the
end of the block. Currently the PEP leaves this unspecified.
Bye,
Walter Dörwald
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