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 <[email protected]> Reviewed-by: Daniel P. Berrangé <[email protected]> Reviewed-by: Philippe Mathieu-Daudé <[email protected]> Message-Id: <[email protected]> Signed-off-by: Stefan Hajnoczi <[email protected]>
KIT-OSGroup · Nov 13, 2020 · 1bd90bb · 1bd90bb
1 parent 1fa8633
commit 1bd90bb
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
@@ -387,12 +387,12 @@ 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):