python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Tools/scripts/findlinksto.py

@@ -0,0 +1,43 @@
+#! /usr/bin/env python3
+
+# findlinksto
+#
+# find symbolic links to a path matching a regular expression
+
+import os
+import sys
+import re
+import getopt
+
+def main():
+    try:
+        opts, args = getopt.getopt(sys.argv[1:], '')
+        if len(args) < 2:
+            raise getopt.GetoptError('not enough arguments', None)
+    except getopt.GetoptError as msg:
+        sys.stdout = sys.stderr
+        print(msg)
+        print('usage: findlinksto pattern directory ...')
+        sys.exit(2)
+    pat, dirs = args[0], args[1:]
+    prog = re.compile(pat)
+    for dirname in dirs:
+        os.walk(dirname, visit, prog)
+
+def visit(prog, dirname, names):
+    if os.path.islink(dirname):
+        names[:] = []
+        return
+    if os.path.ismount(dirname):
+        print('descend into', dirname)
+    for name in names:
+        name = os.path.join(dirname, name)
+        try:
+            linkto = os.readlink(name)
+            if prog.search(linkto) is not None:
+                print(name, '->', linkto)
+        except OSError:
+            pass
+
+if __name__ == '__main__':
+    main()