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    <p>+1 to @icktoofay - I would put more stock in that answer than mine, so take this one with a grain of salt as it is my admittedly inexperienced understanding of the process:</p> <p>As mentioned by others, your main issue is circular imports. Others will comment more intelligently, but the gist of what is happening is:</p> <ol> <li><code>import B</code> - this happens as soon as you run A.py`, so you then go to B.py and immediately come across import A.</li> <li>As <code>A</code> has a different name in the current namespace, it gets imported again (to verify this, add <code>print __name__</code> above <code>import B</code> in <code>A.py</code> - you'll see two different names appear).</li> <li>When <code>A</code> gets imported into <code>B</code>, it brings the <code>__global__ = 'not seen yet'</code> declaration with it, so when you say <code>self.glo = A.__global__</code>, you are getting that variable (and not the modified one because that particular code doesn't get executed in <em>this</em> version of <code>A</code>).</li> <li>Same with <code>A.Data.__var__</code> - you haven't run <code>init</code> in this module (because it isn't your 'main' <code>A</code>), so nothing has been modified yet.</li> <li>Per the above, you can see why <code>A.__global__</code> and <code>A.Data.__var__</code> will also show 'not seen yet' - they haven't been modified and are the same as the variables above.</li> <li>Your code in <code>A</code> in the <code>__main__</code> section executes as normal because it is operating on that version of the module, which does go through all of the initializations you specify.</li> </ol>
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    1. POValue of variable referenced from another module does not change after it is changed in its own module
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    1. USRocketDonkey
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    1. COyes, thanks for your answer, I did find the root cause just now. :-D
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      1. USKelvin Hu
    2. CO@KelvinHu Awesome, good to hear :)
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