Updated Debugging segfaults and hard to decipher pybind11 bugs (markdown)

Debugging-segfaults-and-hard-to-decipher-pybind11-bugs.md

@@ -5,6 +5,7 @@ This is meant to aide in debugging hard-to-decipher pybind11 bugs (or surprises
 Generally, it's easiest to get a sense of where things are failing by using the `trace` module. Here's some code that can be copied+pasted. For examples here, assume these functions are defined in `debug.py` (Python 3.5+ only):
 
 ```py
+# -*- coding: utf-8 -*-
 """
 Utilities that should be synchronized with:
 https://drake.mit.edu/python_bindings.html#debugging-with-the-python-bindings
@@ -16,14 +17,13 @@ def reexecute_if_unbuffered():
     ONLY use this at your entrypoint. Otherwise, you may have code be
     re-executed that will clutter your console."""
     import os
-    import shlex
     import sys
+
     if os.environ.get("PYTHONUNBUFFERED") in (None, ""):
         os.environ["PYTHONUNBUFFERED"] = "1"
         argv = list(sys.argv)
         if argv[0] != sys.executable:
             argv.insert(0, sys.executable)
-        cmd = " ".join([shlex.quote(arg) for arg in argv])
         sys.stdout.flush()
         os.execv(argv[0], argv)
 
@@ -34,6 +34,7 @@ def traced(func, ignoredirs=None):
     import functools
     import sys
     import trace
+
     if ignoredirs is None:
         ignoredirs = ["/usr", sys.prefix]
     tracer = trace.Trace(trace=1, count=0, ignoredirs=ignoredirs)