python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Tools/scripts/checkpyc.py

@@ -0,0 +1,69 @@
+#! /usr/bin/env python3
+# Check that all ".pyc" files exist and are up-to-date
+# Uses module 'os'
+
+import sys
+import os
+from stat import ST_MTIME
+import importlib.util
+
+# PEP 3147 compatibility (PYC Repository Directories)
+cache_from_source = (importlib.util.cache_from_source if sys.implementation.cache_tag
+                     else lambda path: path + 'c')
+
+
+def main():
+    if len(sys.argv) > 1:
+        verbose = (sys.argv[1] == '-v')
+        silent = (sys.argv[1] == '-s')
+    else:
+        verbose = silent = False
+    MAGIC = importlib.util.MAGIC_NUMBER
+    if not silent:
+        print('Using MAGIC word', repr(MAGIC))
+    for dirname in sys.path:
+        try:
+            names = os.listdir(dirname)
+        except OSError:
+            print('Cannot list directory', repr(dirname))
+            continue
+        if not silent:
+            print('Checking ', repr(dirname), '...')
+        for name in sorted(names):
+            if name.endswith('.py'):
+                name = os.path.join(dirname, name)
+                try:
+                    st = os.stat(name)
+                except OSError:
+                    print('Cannot stat', repr(name))
+                    continue
+                if verbose:
+                    print('Check', repr(name), '...')
+                name_c = cache_from_source(name)
+                try:
+                    with open(name_c, 'rb') as f:
+                        magic_str = f.read(4)
+                        mtime_str = f.read(4)
+                except IOError:
+                    print('Cannot open', repr(name_c))
+                    continue
+                if magic_str != MAGIC:
+                    print('Bad MAGIC word in ".pyc" file', end=' ')
+                    print(repr(name_c))
+                    continue
+                mtime = get_long(mtime_str)
+                if mtime in {0, -1}:
+                    print('Bad ".pyc" file', repr(name_c))
+                elif mtime != st[ST_MTIME]:
+                    print('Out-of-date ".pyc" file', end=' ')
+                    print(repr(name_c))
+
+
+def get_long(s):
+    if len(s) != 4:
+        return -1
+    return s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
+
+
+if __name__ == '__main__':
+    main()