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64 lines
2.5 KiB
Python
64 lines
2.5 KiB
Python
"""
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You can use verify() just like assert, with these small differences:
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- you may need to "import Verify", if someone hasn't done it
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for you.
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- unlike assert where using parenthises are optional, verify()
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requires them.
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e.g.:
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assert foo # OK
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verify foo # Error
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assert foo # Not Recomended (may be interpreted as a tuple)
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verify(foo) # OK
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- verify() will print something like the following before raising
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an exception:
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verify failed:
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File "direct/src/showbase/ShowBase.py", line 60
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- verify() will optionally start pdb for you (this is currently
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false by default). You can either edit Verify.py to set
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wantVerifyPdb = 1 or if you are using ShowBase you can set
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want-verify-pdb 1 in your Configrc to start pdb automatically.
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- verify() will still function in the release build. It will
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not be removed by -O like assert will.
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verify() will also throw an AssertionError, but you can ignore that if you
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like (I don't suggest trying to catch it, it's just doing it so that it can
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replace assert more fully).
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Please do not use assert for things that you want run on release builds.
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That is a bad thing to do. One of the main reasons that assert exists
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is to stip out debug code from a release build. The fact that it throws
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an exception can get it mistaken for an error handler. If your code
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needs to handle an error or throw an exception, you should do that
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(and not just assert for it).
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If you want to be a super keen software engineer then avoid using verify().
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If you want to be, or already are, a super keen software engineer, but
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you don't always have the time to write proper error handling, go ahead
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and use verify() -- that's what it's for.
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Please use assert (properly) and do proper error handling; and use verify()
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only when debugging (i.e. when it won't be checked-in) or where it helps
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you resist using assert for error handling.
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"""
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wantVerifyPdb = 0 # Set to true to load pdb on failure.
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def verify(assertion):
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"""
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verify() is intended to be used in place of assert where you
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wish to have the assertion checked, even in release (-O) code.
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"""
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if not assertion:
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print "\n\nverify failed:"
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import sys
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print " File \"%s\", line %d"%(
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sys._getframe(1).f_code.co_filename,
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sys._getframe(1).f_lineno)
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if wantVerifyPdb:
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import pdb
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pdb.set_trace()
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raise AssertionError
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if not hasattr(__builtins__, "verify"):
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__builtins__["verify"] = verify
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