python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/macurl2path.py

@@ -0,0 +1,77 @@
+"""Macintosh-specific module for conversion between pathnames and URLs.
+
+Do not import directly; use urllib instead."""
+
+import urllib.parse
+import os
+
+__all__ = ["url2pathname","pathname2url"]
+
+def url2pathname(pathname):
+    """OS-specific conversion from a relative URL of the 'file' scheme
+    to a file system path; not recommended for general use."""
+    #
+    # XXXX The .. handling should be fixed...
+    #
+    tp = urllib.parse.splittype(pathname)[0]
+    if tp and tp != 'file':
+        raise RuntimeError('Cannot convert non-local URL to pathname')
+    # Turn starting /// into /, an empty hostname means current host
+    if pathname[:3] == '///':
+        pathname = pathname[2:]
+    elif pathname[:2] == '//':
+        raise RuntimeError('Cannot convert non-local URL to pathname')
+    components = pathname.split('/')
+    # Remove . and embedded ..
+    i = 0
+    while i < len(components):
+        if components[i] == '.':
+            del components[i]
+        elif components[i] == '..' and i > 0 and \
+                                  components[i-1] not in ('', '..'):
+            del components[i-1:i+1]
+            i = i-1
+        elif components[i] == '' and i > 0 and components[i-1] != '':
+            del components[i]
+        else:
+            i = i+1
+    if not components[0]:
+        # Absolute unix path, don't start with colon
+        rv = ':'.join(components[1:])
+    else:
+        # relative unix path, start with colon. First replace
+        # leading .. by empty strings (giving ::file)
+        i = 0
+        while i < len(components) and components[i] == '..':
+            components[i] = ''
+            i = i + 1
+        rv = ':' + ':'.join(components)
+    # and finally unquote slashes and other funny characters
+    return urllib.parse.unquote(rv)
+
+def pathname2url(pathname):
+    """OS-specific conversion from a file system path to a relative URL
+    of the 'file' scheme; not recommended for general use."""
+    if '/' in pathname:
+        raise RuntimeError("Cannot convert pathname containing slashes")
+    components = pathname.split(':')
+    # Remove empty first and/or last component
+    if components[0] == '':
+        del components[0]
+    if components[-1] == '':
+        del components[-1]
+    # Replace empty string ('::') by .. (will result in '/../' later)
+    for i in range(len(components)):
+        if components[i] == '':
+            components[i] = '..'
+    # Truncate names longer than 31 bytes
+    components = map(_pncomp2url, components)
+
+    if os.path.isabs(pathname):
+        return '/' + '/'.join(components)
+    else:
+        return '/'.join(components)
+
+def _pncomp2url(component):
+    # We want to quote slashes
+    return urllib.parse.quote(component[:31], safe='')