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The second step is to identify which specific imported module is the source of the problem. The first step established that importlib is not itself the cause of the problem. On my system (ArchLinux, Python-3.5.2, Qt-5.7.1, PyQt-5.7), the second one produces the following output: Sys Path: Run the script like this: $ python /tmp/test.py 1 (Even if option 2 doesn't hang, the sys.path details are likely to be relevant). Please run this script exactly as described below, and add the output to your question. It is vital to proceed one step at a time, and be careful to avoid introducing any potentially confounding variables. It tests just one thing: does calling importlib.import_module after creating a QApplication make the interpreter hang on your system? Note that, for now, it only tries to import a module from the python standard library. This is not (yet) a real answer, but it might provide the first step in how to find one.īelow is the minimal test case I suggested in my first comment on the question.