Updates checked-in line endings on several files.

Make also minor PEP8 coding style fixes on modified imports.

is now of type "const char *" rather of "char *".

so let's defer this until 3.7, 3.8, ... all have this new function.

  - There was no real problem to begin with.

  - The hypothetical problem has been fixed by 5bdc8e1a50c8.

maintenance issues (cost/benefit).

path in order to avoid maintenance issues.

path and cause maintenance issues (3.6 <-> 3.7, private test suite).

Issue #28915: Without parenthesis, _PyObject_CallMethodId() avoids the creation
a temporary tuple, and so is more efficient.

Replace:
    PyObject_CallObject(callable, NULL)
with:
    _PyObject_CallNoArg(callable)

The latter function is more readable, faster and doesn't raise exceptions.

Thanks to Georg Brandl for the patch.

eliminate all internal uses of overridden methods.

Mark Dickinson.

This allows sys.getsize() to work correctly with their subclasses with
__slots__ defined.

As suggested by Steve Dower and approved by Stefan Krah.

Using LF can a script to fail if it tries to use a label that is
split across 512 byte blocks.  Who knows why.

Fixed 2 to 3 porting bug in pynche.ColorDB.

Corresponding functions now accept `const char *` (issue #1772673).

self-contained, this change facilitates maintenance and the Python version
can be easily imported for experimentation.

with an external libmpdec.

test files.

requires them.  Disable executable bits and shebang lines in test and
benchmark files in order to prevent using a random system python, and in
source files of modules which don't provide command line interface.  Fixed
shebang line to use python3 executable in the unittestgui script.