What's the difference between VAR and _VAR_?

[Johnny Lee]

Hi,
   I'm new in python and I was wondering what's the difference between
the two code section below:

(I)
class TestResult:
        _pass_ = "pass"
        _fail_ = "fail"
        _exception_ = "exception"

(II)
class TestResult:
        pass = "pass"
        fail = "fail"
        exception = "exception"

   Thanks for your help.

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