python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Tools/scripts/linktree.py

@@ -0,0 +1,80 @@
+#! /usr/bin/env python3
+
+# linktree
+#
+# Make a copy of a directory tree with symbolic links to all files in the
+# original tree.
+# All symbolic links go to a special symbolic link at the top, so you
+# can easily fix things if the original source tree moves.
+# See also "mkreal".
+#
+# usage: mklinks oldtree newtree
+
+import sys, os
+
+LINK = '.LINK' # Name of special symlink at the top.
+
+debug = 0
+
+def main():
+    if not 3 <= len(sys.argv) <= 4:
+        print('usage:', sys.argv[0], 'oldtree newtree [linkto]')
+        return 2
+    oldtree, newtree = sys.argv[1], sys.argv[2]
+    if len(sys.argv) > 3:
+        link = sys.argv[3]
+        link_may_fail = 1
+    else:
+        link = LINK
+        link_may_fail = 0
+    if not os.path.isdir(oldtree):
+        print(oldtree + ': not a directory')
+        return 1
+    try:
+        os.mkdir(newtree, 0o777)
+    except OSError as msg:
+        print(newtree + ': cannot mkdir:', msg)
+        return 1
+    linkname = os.path.join(newtree, link)
+    try:
+        os.symlink(os.path.join(os.pardir, oldtree), linkname)
+    except OSError as msg:
+        if not link_may_fail:
+            print(linkname + ': cannot symlink:', msg)
+            return 1
+        else:
+            print(linkname + ': warning: cannot symlink:', msg)
+    linknames(oldtree, newtree, link)
+    return 0
+
+def linknames(old, new, link):
+    if debug: print('linknames', (old, new, link))
+    try:
+        names = os.listdir(old)
+    except OSError as msg:
+        print(old + ': warning: cannot listdir:', msg)
+        return
+    for name in names:
+        if name not in (os.curdir, os.pardir):
+            oldname = os.path.join(old, name)
+            linkname = os.path.join(link, name)
+            newname = os.path.join(new, name)
+            if debug > 1: print(oldname, newname, linkname)
+            if os.path.isdir(oldname) and \
+               not os.path.islink(oldname):
+                try:
+                    os.mkdir(newname, 0o777)
+                    ok = 1
+                except:
+                    print(newname + \
+                          ': warning: cannot mkdir:', msg)
+                    ok = 0
+                if ok:
+                    linkname = os.path.join(os.pardir,
+                                            linkname)
+                    linknames(oldname, newname, linkname)
+            else:
+                os.symlink(linkname, newname)
+
+if __name__ == '__main__':
+    sys.exit(main())