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-rw-r--r--coverage/collector.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/coverage/collector.py b/coverage/collector.py
index 06ccda7e..55211f2a 100644
--- a/coverage/collector.py
+++ b/coverage/collector.py
@@ -60,7 +60,10 @@ class PyTracer(object):
# in this file.
self.data_stack.append((self.cur_file_data, self.last_line))
filename = frame.f_code.co_filename
- tracename = self.should_trace(filename, frame)
+ tracename = self.should_trace_cache.get(filename)
+ if tracename is None:
+ tracename = self.should_trace(filename, frame)
+ self.should_trace_cache[filename] = tracename
if tracename:
if tracename not in self.data:
self.data[tracename] = {}