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Lancelot SIX f9e59d060f Use is/is not to check for None in python code. 
While reviewing a patch sent to the mailing list, I noticed there are few
places where python code checks if a variable is 'None' or not by using the
comparison operators '==' and '!='.  PEP8[1], which is used as coding standard
in GDB coding standards, recommends using 'is' / 'is not' when comparing to a
singleton such as 'None'.

This patch proposes to change the instances of '== None' by 'is None' and
'!= None' by 'is not None'.

[1] https://www.python.org/dev/peps/pep-0008/

gdb/doc/ChangeLog:

	* python.texi (Writing a Pretty-Printer): Use 'is None' instead of
	'== None'.

gdb/ChangeLog:

	* python/lib/gdb/FrameDecorator.py (FrameDecorator): Use 'is None' instead of
	'== None'.
	(FrameVars): Use 'is not None' instead of '!= None'.
	* python/lib/gdb/command/frame_filters.py (SetFrameFilterPriority): Use 'is None'
	instead of '== None' and 'is not None' instead of '!= None'.

gdb/testsuite/ChangeLog:

	* gdb.base/premature-dummy-frame-removal.py (TestUnwinder): Use
	'is None' instead of '== None' and 'is not None' instead of
	'!= None'.
	* gdb.python/py-frame-args.py (lookup_function): Same.
	* gdb.python/py-framefilter-invalidarg.py (Reverse_Function): Same.
	* gdb.python/py-framefilter.py (Reverse_Function): Same.
	* gdb.python/py-nested-maps.py (lookup_function): Same.
	* gdb.python/py-objfile-script-gdb.py (lookup_function): Same.
	* gdb.python/py-prettyprint.py (lookup_function): Same.
	* gdb.python/py-section-script.py (lookup_function): Same.
	* gdb.python/py-unwind-inline.py (dummy_unwinder): Same.
	* gdb.python/python.exp: Same.
	* gdb.rust/pp.py (lookup_function): Same.
2021-06-08 23:49:05 +01:00
..
.gitignore
a4rc.sed
agentexpr.texi Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
all-cfg.texi Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
annotate.texinfo Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
ChangeLog Use is/is not to check for None in python code. 2021-06-08 23:49:05 +01:00
doxy-index.in Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
Doxyfile-base.in Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
Doxyfile-gdb-api.in Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
Doxyfile-gdb-xref.in Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
Doxyfile-gdbserver.in Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
fdl.texi
filter-for-doxygen
filter-params.pl
gdb.texinfo arc: Add 'set disassembler-options' support 2021-06-05 11:43:07 +02:00
gpl.texi
guile.texi Guile: add value-const-value 2021-05-12 12:35:36 +01:00
lpsrc.sed
Makefile.in Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
psrc.sed
python.texi Use is/is not to check for None in python code. 2021-06-08 23:49:05 +01:00
refcard.tex Manual updates of copyright year range not covered by gdb/copyright.py 2021-01-01 12:13:21 +04:00
stabs.texinfo Update copyright year range in all GDB files 2021-01-01 12:12:21 +04:00
stack_frame.eps
stack_frame.pdf
stack_frame.png
stack_frame.svg
stack_frame.txt