> Btw, just to be clear: in pure Python, deferred instantiation is
> already impossible; implicit instantiation is exactly equivalent
> to explicit.
Almost exactly:
>>> def f():
raise ValueError, 1
>>> def g():
raise ValueError(1)
>>> from dis import dis
>>> dis(f)
2 0 LOAD_GLOBAL 0 (ValueError)
3 LOAD_CONST 1 (1)
6 RAISE_VARARGS 2
9 LOAD_CONST 0 (None)
12 RETURN_VALUE
>>> dis(g)
2 0 LOAD_GLOBAL 0 (ValueError)
3 LOAD_CONST 1 (1)
6 CALL_FUNCTION 1
9 RAISE_VARARGS 1
12 LOAD_CONST 0 (None)
15 RETURN_VALUE
On a separate note, I was experimented with explicit instantiation
and noticed an oddity with my editor's autocomplete. Upon typing:
raise TypeError(
the autocompleter looks up the doc string for TypeError and announces:
Inappropriate argument type
when you were likely expecting to be prompted for the exception value.
Perhaps the doc string should read like this:
TypeError([exceptionvalue]) --> Exception for inappropriate argument type.
Raymond Hettinger
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