How can I make my assertions smarter?
Magnus L. Hetland
mlh at vier.idi.ntnu.no
Mon Nov 1 16:55:02 CET 1999
Stuart Hungerford <stuart.hungerford at webone.com.au> writes:
> Hi all,
> I'm using some simple functions to implement crude precondition,
> postcondition and invariant checking in Python classes.
> (Tim: please be gentle ;-)
> Is there some neat way to wrap these tests up so I can print any
> code expression that fails, e.g:
> Precondition failed foo.py line 42: spoon.shape == 'bent'
> which would appear at line 42 of foo.py as
> pre(spoon.shape == 'bent')
How about using (assuming that you won't use assert):
pre("spoon.shape == 'bent'")
And then using eval() in your code? Like...
if not eval(condition):
raise "Precondition Failure", condition
Pretty simple, IMO...
Magnus Echelon jamming noise:
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