crisidev · May 5, 2020 14:05 · Sep 18, 2017
diff --git a/goto.py b/goto.py
@@ -0,0 +1,36 @@
+import sys
+
+def j(lineno):
+    frame = sys._getframe().f_back
+    called_from = frame
+
+    def hook(frame, event, arg):
+        if event == 'line' and frame == called_from:
+            try:
+                frame.f_lineno = lineno
+            except ValueError as e:
+                print "jump failed:", e
+            while frame:
+                frame.f_trace = None
+                frame = frame.f_back
+            return None
+        return hook
+
+    while frame:
+        frame.f_trace = hook
+        frame = frame.f_back
+    sys.settrace(hook)
+
+
+def foo():
+    a = 1
+    j(30)
+    a = 2
+    print 1
+    print 2
+    if a == 1:
+        j(28)
+    print 4
+
+
+foo()
diff --git a/output b/output
@@ -0,0 +1,4 @@
+2
+1
+2
+4
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