- Issue #17756: Fix test_code test when run from the installed location.

Initial patch by Vajrasky Kok.

Suggested by: Tal Einat

* Repair the broken link to norobots-rfc.txt.

* HTTP response codes >= 500 treated as a failed read rather than as a not
found.  Not found means that we can assume the entire site is allowed.  A 5xx
server error tells us nothing.

* A successful read() or parse() updates the mtime (which is defined to be "the
  time the robots.txt file was last fetched").

* The can_fetch() method returns False unless we've had a read() with a 2xx or
4xx response.  This avoids false positives in the case where a user calls
can_fetch() before calling read().

* I don't see any easy way to test this patch without hitting internet
resources that might change or without use of mock objects that wouldn't
provide must reassurance.

documentation contains characters not encodable to the stdout encoding.

contains characters not encodable to the stdout encoding.

called without argument and without current frame (ex: embedded Python).

argument and without current frame (ex: embedded Python).

subprocess code example

example

return an int

Issue #16531: ipaddress.IPv4Network and ipaddress.IPv6Network now accept an (address, netmask) tuple argument, so as to easily construct network objects from existing addresses.

Merge 3.4->default: asyncio: Fix upstream issue 168: StreamReader.read(-1) from pipe may hang if data exceeds buffer limit.

asyncio: Fix upstream issue 168: StreamReader.read(-1) from pipe may hang if data exceeds buffer limit.

source directory.

consolidating and improving human-validated tests of Idle. Change other files
as needed to work with htest.  Running the module as __main__ runs all tests.

s/Unix/POSIX/.

more accurate and sounds less like a strange tale of yore.

a Security Considerations section as preferred by both the devguide
and documentation users who do not wish to go insane.