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POGlobal name is not defined for second unittest
 

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    <p>Eclipse platform, Python 3.3.</p> <p>I've created the code below to demonstrate a problem when using global variables and python unittest. I'd like to know why the second unit test (a direct repeat of the first) results in a </p> <pre><code>NameError: global name '_fred' is not defined </code></pre> <p>try commenting out the second test and it'll all pass ok.<br> (Note: I've added a brief digest of what the real code is is attempting to achieve after the example, hopefully it'll be less obtrusive there as it's not really relevant to the issue)</p> <pre class="lang-python prettyprint-override"><code>''' Global Problem ''' import unittest _fred = None def start(): global _fred if _fred is None: _fred = 39 _fred += 3 def stop(): global _fred if _fred is not None: del _fred class Test(unittest.TestCase): def setUp(self): start() def tearDown(self): stop() def test_running_first_time(self): assert(_fred == 42) def test_running_second_time(self): assert(_fred == 42) if __name__ == "__main__": #import sys;sys.argv = ['', 'Test.testName'] unittest.main() </code></pre> <p>In the real code _fred is variable referencing an instance of a class derived from Thread (see what I did there) and gets assigned in the start method.<br> _fred = MyThreadClass()<br> There is a second global for a synchronized queue.<br> The methods start and stop control processing queue items on the dedicated thread. 'stop' stops the processing while allowing items to be added.<br> The API for Thread only permits a single call to start. So to restart processing I need a new instance of Thread. Hence the use of</p> <pre><code>if _fred is None: </code></pre> <p>and</p> <pre><code>del _fred </code></pre> <p>No prizes for guessing my primary language</p>
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