A numerical value argument of the os.putenv() call causes my python3.5 to crash with SIGSEGV, for example:

Python 3.5.0+ (default, Oct 11 2015, 09:05:38) 
[GCC 5.2.1 20151010] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.putenv('AAA', 1)
Segmentation fault (core dumped)

While numerical 1 (one) is not a valid argument for the function which expects a string as value, it shouldn't crash but rather throw an exception. This seems to be the behaviour in python3.4:

Python 3.4.3 (default, Oct 14 2015, 20:28:29) 
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.putenv('AAA', 1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: Can't convert 'int' object to str implicitly
>>>

I can provide a strace/ltrace/core dump but it's huge and I'm not sure if it's necessary taking into account that this issue is trivial to reproduce.

New changeset 3ae62099d70b by Benjamin Peterson in branch '3.5':
make the PyUnicode_FSConverter cleanup set the decrefed argument to NULL (closes #25630)
https://hg.python.org/cpython/rev/3ae62099d70b

New changeset d8d67b502bcc by Benjamin Peterson in branch 'default':
merge 3.5 (#25630)
https://hg.python.org/cpython/rev/d8d67b502bcc