On Windows os.open() error message doesn't contain file name.

- Alex J Burke noticed a debugging raise in the commit that
  fixed the original bug reported in issue 20317
- this showed that multiple iterations through the affected
  loop wasn't actually being tested

representation in Tcl and Python.

These files have shebangs and executable bits in the libffi distribution.

It tests the convertion Tcl values to Python values when Tcl calls a command
implemented on Python. Currently all values are passed as strings.

Original patches by Edmond Burnett and Kent Johnson.

completely redundant. After 16638 patch, CallTips.get_argspec trims over-long
signature strings as well as docstring lines.

Idle calltips. This is needed for builtins, such bytes (which is why 5).
Based on patch by Serhiy Storchaka.

Initial patch by Roger Serwy.

cases when multibyte characters are in line (before "^").  This still not
works correctly with wide East Asian characters.

for 'access' in winreg.DeleteKeyEx.  Already correct in the docs
function signature and docstring.  Noticed by Justin Foo.

time.perf_counter()

Move also the unit test at the end.

instead of rounding towards zero. For example, a timeout of one microsecond is
now rounded to one millisecond, instead of being rounded to zero.