CLI running `python3 -m pyflowchart simple.py` got no outputs

[cdfmlr]

People complain to me about pyflowchart outputting nothing! Here is an example:

Where simple.py is defined as:

from pkgutil import get_data

def foo(a, b):
    if a:
        print("a")
    else:
        for i in range(3):
            print("b")
    return a + b

Awfully strange it is that pyflowchart works well on my mac for the instance above:

Whatever I know at the moment is that the described wrong behavior may be another bug related to the Windows :(

To handle this, I need more feedback.