On 10/10/19 2:21 PM, Stefan Hajnoczi wrote:
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.
Ah this is a new change from 3.8...
https://docs.python.org/3.9/whatsnew/3.8.html
From https://bugs.python.org/issue34850
Reported-by: Daniel P. Berrangé <berra...@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
---
scripts/tracetool/__init__.py | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index 04279fa62e..44c118bc2a 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -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):
