You can use
verify() just like assert, with these small differences:
you may need to
import Verify, if someone hasn’t done it for you.
unlike assert where using parentheses are optional,
verify()requires them, e.g.:
assert foo # OK verify foo # Error assert foo # Not Recomended (may be interpreted as a tuple) verify(foo) # OK
verify()will print something like this before raising an exception:
verify failed: File "direct/src/showbase/ShowBase.py", line 60
verify()will optionally start pdb for you (this is currently false by default). You can either edit Verify.py to set
wantVerifyPdb = 1or if you are using ShowBase you can set
want-verify-pdb 1in your Config.prc file to start pdb automatically.
verify()will still function in the release build. It will not be removed by -O like assert will.
verify() will also throw an AssertionError, but you can ignore that if
you like (I don’t suggest trying to catch it, it’s just doing it so that it can
replace assert more fully).
Please do not use assert for things that you want run on release builds. That is a bad thing to do. One of the main reasons that assert exists is to stip out debug code from a release build. The fact that it throws an exception can get it mistaken for an error handler. If your code needs to handle an error or throw an exception, you should do that (and not just assert for it).
If you want to be a super keen software engineer then avoid using
verify(). If you want to be, or already are, a super keen software
engineer, but you don’t always have the time to write proper error handling,
go ahead and use
verify() – that’s what it’s for.
Please use assert (properly) and do proper error handling; and use
verify() only when debugging (i.e. when it won’t be checked-in) or
where it helps you resist using assert for error handling.
verify() is intended to be used in place of assert where you wish to have the assertion checked, even in release (-O) code.