[EMAIL PROTECTED] wrote:
> I initially thought that generator/generator expression is cool (sort of
> like the lazy evaluation in Haskell) until I notice this side effect.
>
> >>>a=(x for x in range(2))
> >>>list(a)
> [1,2]
> >>>list(a)
> []
>
> Would this make generator/generator expression's usage pretty limited ?
nope.
> As when the program/system goes beyond a single module, this behaviour
> can cause subtle bugs ?
sure, in the same way as
>>> f = open(filename)
>>> f.read()
'hello world\n'
>>> f.read() # oops!
''
causes subtle bugs (that is, almost never)
</F>
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