Commit 403e11ed authored Oct 10, 2019 by Stefan Hajnoczi

trace: avoid "is" with a literal Python 3.8 warnings



The following statement produces a SyntaxWarning with Python 3.8:

  if len(format) is 0:
  scripts/tracetool/__init__.py:459: SyntaxWarning: "is" with a literal. Did you mean "=="?

Use the conventional len(x) == 0 syntax instead.

Reported-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20191010122154.10553-1-stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

parent bd200384

scripts/tracetool/init.py

+2 −2

Original line number	Diff line number	Diff line
		@@ -456,12 +456,12 @@ def generate(events, group, format, backends,
		import tracetool

		format = str(format)
		if len(format) is 0:
		if len(format) == 0:
		raise TracetoolError("format not set")
		if not tracetool.format.exists(format):
		raise TracetoolError("unknown format: %s" % format)

		if len(backends) is 0:
		if len(backends) == 0:
		raise TracetoolError("no backends specified")
		for backend in backends:
		if not tracetool.backend.exists(backend):