There's a simpler way to do it

devel/devel-server.py

@@ -47,32 +47,12 @@ class MothRequestHandler(http.server.SimpleHTTPRequestHandler):
 
     # Backport from Python 3.7
     def translate_path(self, path):
-        """Translate a /-separated PATH to the local filename syntax.
-        Components that mean special things to the local file system
-        (e.g. drive or directory names) are ignored.  (XXX They should
-        probably be diagnosed.)
-        """
-        # abandon query parameters
-        path = path.split('?',1)[0]
-        path = path.split('#',1)[0]
-        # Don't forget explicit trailing slash when normalizing. Issue17324
-        trailing_slash = path.rstrip().endswith('/')
-        try:
-            path = urllib.parse.unquote(path, errors='surrogatepass')
-        except UnicodeDecodeError:
-            path = urllib.parse.unquote(path)
-        path = posixpath.normpath(path)
-        words = path.split('/')
-        words = filter(None, words)
-        path = self.directory
-        for word in words:
-            if os.path.dirname(word) or word in (os.curdir, os.pardir):
-                # Ignore components that are not a simple file/directory name
-                continue
-            path = os.path.join(path, word)
-        if trailing_slash:
-            path += '/'
-        return path
+        # I guess we just hope that some other thread doesn't call getcwd
+        getcwd = os.getcwd
+        os.getcwd = lambda: self.directory
+        ret = super().translate_path(path)
+        os.getcwd = getcwd
+        return ret
 
 
     def get_puzzle(self):