Python - no python function names

I just installed Beta Update 1 (build 466719) of VTune Amplifier XE 2017 on windows.  I created a trivial program (below) but I can't see any Python function names in VTune.  It only shows made up names such as func@0x1d001133 and no source file names.  So completely useless.

I've listed several directories in the Source File locations.  

The collection log complains about not having debug symbols for various DLLs and the python.exe, but says nothing about missing python source.

What's my problem?

Thanks.

import math

def method_a():
  method_b()


def method_b():
  method_c()


def method_c():
  for i in range(1, 100000000):
    s = math.sqrt(i)

method_a()