Terry J. Reedy <tjre...@udel.edu> added the comment:

If keywords are included when the REPL has tab completions (which Windows 
doesn't), then it is plausible that IDLE should.  It could be considered part 
of 'Shell should (mostly) imitate REPL'.  But I can see Tal's point, though the 
relative expansion is pretty small.  And there is nothing on the master 
completions issue #27609 where I collected known not-yet-rejected suggestions 
and ideas.

The implementation is trivial.  Add two new lines to autocomplete.py.  So you 
can easily patch a private copy.  I am preparing a minimal PR.

import keyword  # add
...
    def fetch_completions(self, what, mode):
...
                    bigl = eval("dir()", namespace)
                    bigl.extend(keyword.kwlist)  # add
                    bigl.sort()

True, False, and None are also in builtins, so cannot serve as a test.
---

A separate idea: annotate completion list, at least as an option, with 
'keyword' or class, possibly prefixed with 'built-in', so 'built-in function', 
'function', and so on.

----------
nosy:  -rhettinger
stage:  -> test needed
title: Include keywords in autocomplete list for IDLE -> IDLE: Include keywords 
in __main__ autocomplete list
versions: +Python 3.7, Python 3.8

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<https://bugs.python.org/issue37765>
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