Log Message:
Python 3.5.4:

Security
* bpo-30730: Prevent environment variables injection in subprocess on Windows. \ 
Prevent passing other environment variables and command arguments.
* bpo-30694: Upgrade expat copy from 2.2.0 to 2.2.1 to get fixes of multiple \ 
security vulnerabilities including: CVE-2017-9233 (External entity infinite loop \ 
DoS), CVE-2016-9063 (Integer overflow, re-fix), CVE-2016-0718 (Fix regression \ 
bugs from 2.2.0’s fix to CVE-2016-0718) and CVE-2012-0876 (Counter hash \ 
flooding with SipHash). Note: the CVE-2016-5300 (Use os- specific entropy \ 
sources like getrandom) doesn’t impact Python, since Python already gets \ 
entropy from the OS to set the expat secret using XML_SetHashSalt().
* bpo-30500: Fix urllib.parse.splithost() to correctly parse fragments. For \ 
example, splithost('//127.0.0.1#@evil.com/') now correctly returns the 127.0.0.1 \ 
host, instead of treating @evil.com as the host in an authentification \ 
(login@host).
* bpo-29591: Update expat copy from 2.1.1 to 2.2.0 to get fixes of CVE-2016-0718 \ 
and CVE-2016-4472. See https://sourceforge.net/p/expat/bugs/537/ for more \ 
information.