Terry J. Reedy added the comment:
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change does not happen with other keywords (or 3.x)
The underlying cause is that 'print' is both in keyword.kwlist and in module
__builtin__ (for use when the print_function future import suppresses
recognition of print as keyword). Hence it is in both the partial regexes that
get concatenated together at the top of ColorDelegator.py and used with .match
on lines 201 and 232.
The proximal cause is that .match in recolorize_main, 201, 232 gives different
answers without or with a leading space.
import keyword
import __builtin__
import re
def any(name, alternates):
"Return a named group pattern matching list of alternates."
return "(?P<%s>" % name + "|".join(alternates) + ")"
kw = r"\b" + any("KEYWORD", keyword.kwlist) + r"\b"
builtinlist = [str(name) for name in dir(__builtin__)]
builtin = r"([^.'\"\\#]\b|^)" + any("BUILTIN", builtinlist) + r"\b"
prog = re.compile(kw + "|" + builtin , re.S)
print(prog.match('print').groupdict().items())
print(prog.match(' print').groupdict().items())
>>>
[('BUILTIN', None), ('KEYWORD', 'print')]
[('BUILTIN', 'print'), ('KEYWORD', None)]
The prefix [^.'\"\\#] added to builtin but not kw matches a space. Removing
'print' from builtinlist prevents it from matching as a builtin. I think this
is the right thing to do since Idle cannot know how 'print' will be
interpreted, so should use the keyword default.
builtinlist.remove('print')
I am not going to write a test for this.
----------
assignee: -> terry.reedy
keywords: +patch
nosy: +terry.reedy
stage: -> needs patch
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21029>
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