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In fact, to hopefully make perfectly clear what is going on here, let me demonstrate that *any* executable statement in the module that fails to load is executed if it occurs before the error that causes the load failure:
 rdmurray@hey:~/python/p32>cat temp.py
 import os
 print('foo:', hasattr(os, 'foo'))
 try:
 import temp2
 except AttributeError:
 print('attribute error')
 print('temp2:', 'temp2' in globals())
 print('foo:', hasattr(os, 'foo'))
 rdmurray@hey:~/python/p32>cat temp2.py
 import os
 os.foo = 2
 os.bar
 rdmurray@hey:~/python/p32>./python temp.py
 foo: False
 attribute error
 temp2: False
 foo: True