From c7649842853de89c9a67c3f361f967349b17cb5f Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@nedbatchelder.com>
Date: Thu, 31 Dec 2020 18:34:37 -0500
Subject: A simple tool to see branch tracing arcs

---
 lab/branch_trace.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 lab/branch_trace.py

(limited to 'lab')

diff --git a/lab/branch_trace.py b/lab/branch_trace.py
new file mode 100644
index 00000000..7e8e88f9
--- /dev/null
+++ b/lab/branch_trace.py
@@ -0,0 +1,17 @@
+import sys
+
+pairs = set()
+last = -1
+
+def trace(frame, event, arg):
+    global last
+    if event == "line":
+        this = frame.f_lineno
+        pairs.add((last, this))
+        last = this
+    return trace
+
+code = open(sys.argv[1]).read()
+sys.settrace(trace)
+exec(code)
+print(sorted(pairs))
-- 
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