python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Tools/scripts/which.py

@@ -0,0 +1,60 @@
+#! /usr/bin/env python3
+
+# Variant of "which".
+# On stderr, near and total misses are reported.
+# '-l<flags>' argument adds ls -l<flags> of each file found.
+
+import sys
+if sys.path[0] in (".", ""): del sys.path[0]
+
+import sys, os
+from stat import *
+
+def msg(str):
+    sys.stderr.write(str + '\n')
+
+def main():
+    pathlist = os.environ['PATH'].split(os.pathsep)
+
+    sts = 0
+    longlist = ''
+
+    if sys.argv[1:] and sys.argv[1][:2] == '-l':
+        longlist = sys.argv[1]
+        del sys.argv[1]
+
+    for prog in sys.argv[1:]:
+        ident = ()
+        for dir in pathlist:
+            filename = os.path.join(dir, prog)
+            try:
+                st = os.stat(filename)
+            except OSError:
+                continue
+            if not S_ISREG(st[ST_MODE]):
+                msg(filename + ': not a disk file')
+            else:
+                mode = S_IMODE(st[ST_MODE])
+                if mode & 0o111:
+                    if not ident:
+                        print(filename)
+                        ident = st[:3]
+                    else:
+                        if st[:3] == ident:
+                            s = 'same as: '
+                        else:
+                            s = 'also: '
+                        msg(s + filename)
+                else:
+                    msg(filename + ': not executable')
+            if longlist:
+                sts = os.system('ls ' + longlist + ' ' + filename)
+                if sts: msg('"ls -l" exit status: ' + repr(sts))
+        if not ident:
+            msg(prog + ': not found')
+            sts = 1
+
+    sys.exit(sts)
+
+if __name__ == '__main__':
+    main()