Fixes #1557890.

Will backport to release25-maint.

section with a link to the tutorial sections.

Will backport to release25-maint.

Added relativeCreated to Formatter doc (has been in the system for a long time - was unaccountably left out of the docs and not noticed until now).

argument.

the tuple isn't used as the "exception arguments tuple".

Move assembler structure next to assembler code to make it easier to
move it to a separate file.

GNU modes.

subprocess.

list comprehensions as the builtin compiler, using the LIST_APPEND
opcode.

fix all codecs file wrappers to work correctly with the "with"
statement (bug #1586513).

Will backport.

Will backport.

Will backport.

It seems like this should be a different error than SystemError, but
I don't have any great ideas and SystemError was raised in 2.4 and earlier.

Will backport.

it's held (even by the current thread).

Will backport.

loops are, um, infinite.  These conditions should not be able to happen.

Will backport.

some warnings from Klokwork.  They verify the assumptions of the format
of svn version output.

The assert in the thread module helped debug a problem on HP-UX.