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-rw-r--r--coverage/execfile.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/coverage/execfile.py b/coverage/execfile.py
index 3da3ba1f..38dc1d07 100644
--- a/coverage/execfile.py
+++ b/coverage/execfile.py
@@ -144,7 +144,7 @@ class PyRunner:
self.arg0 = try_filename
break
else:
- raise NoSource("Can't find '__main__' module in '%s'" % self.arg0)
+ raise NoSource(f"Can't find '__main__' module in '{self.arg0}'")
# Make a spec. I don't know if this is the right way to do it.
try_filename = python_reported_file(try_filename)