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

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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>
This commit is contained in:
Stefan Hajnoczi 2019-10-10 13:21:54 +01:00
parent bd200384c5
commit 403e11edbf
1 changed files with 2 additions and 2 deletions
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4
scripts/tracetool/__init__.py
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@ -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):