I'm using Fedora 23.

 meh  ~  1  valgrind python3 -c "import platform; print(platform.system())"
==10093== Memcheck, a memory error detector
==10093== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==10093== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==10093== Command: python3 -c import\ platform;\ print(platform.system())
==10093== 
==10094== Warning: invalid file descriptor 1024 in syscall close()
==10094== Warning: invalid file descriptor 1025 in syscall close()
==10094== Warning: invalid file descriptor 1026 in syscall close()
==10094== Warning: invalid file descriptor 1027 in syscall close()
==10094==    Use --log-fd=<number> to select an alternative log fd.
==10094== Warning: invalid file descriptor 1028 in syscall close()
==10094== Warning: invalid file descriptor 1029 in syscall close()
Linux
==10093== 
==10093== HEAP SUMMARY:
==10093==     in use at exit: 861,318 bytes in 5,903 blocks
==10093==   total heap usage: 71,738 allocs, 65,835 frees, 10,611,196 bytes allocated
==10093== 
==10093== LEAK SUMMARY:
==10093==    definitely lost: 0 bytes in 0 blocks
==10093==    indirectly lost: 0 bytes in 0 blocks
==10093==      possibly lost: 326,619 bytes in 1,420 blocks
==10093==    still reachable: 534,699 bytes in 4,483 blocks
==10093==         suppressed: 0 bytes in 0 blocks
==10093== Rerun with --leak-check=full to see details of leaked memory
==10093== 
==10093== For counts of detected and suppressed errors, rerun with: -v
==10093== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
 meh  ~  1  python3 --version
Python 3.4.3
 meh  ~  1 