Why Python doesn't catch exceptions raised in C++? -

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I am trying to create a Python iterator in boost :: python. So I have the function 

  PyObject * my_iterator_next (MyIterator * iter) {if (! Iter- & gt; is_end ()) {return * (* iter) ++; } Other {PyErr_SetNone (PyExc_StopItation); // It does not work either PyErr_SetString (PyExc_StopItation, "End of Archive"); Return tap; }}   
 In Python:    MyContainer for X in   
 and I can find:  
  1 2 3 No account pack (most recent call final): file "main.py", line 6, & lt ; Module & gt; Print (x) stop bitation: end of collection   
 besides  
  this = my_collection .__ iter __ () try: it .__ next (__) ; This .__ next (__); This .__ next (__); This .__ next (__);   
 This code does not print anything, so no exceptions have been captured.  
 Why?  
  
 
 
 After setting the dragon exception, you should notify Boost like this. Python is as follows:  
  throw_error_already_set ();   
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