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I'm using Tcl/Tk 8.5.4 here
 print(":::")
 print(_flatten((self._w, cmd)) + self._options(cnf))
produces:
:::
('.3073836300', 'configure', '-yscrollcommand', '3077632332set')
:::
('.3073835564.3073835660', 'configure', '-text', 'Python documentation 
server at\nhttp://localhost:7464/')
>>> Exception in thread Thread-1:
Traceback (most recent call last):
 File "/usr/local/lib/python3.0/threading.py", line 507, in 
_bootstrap_inner
 self.run()
 File "/usr/local/lib/python3.0/threading.py", line 462, in run
 self._target(*self._args, **self._kwargs)
 File "/usr/local/lib/python3.0/pydoc.py", line 1989, in serve
 DocServer(port, callback).serve_until_quit()
 File "/usr/local/lib/python3.0/pydoc.py", line 1971, in __init__
 self.base.__init__(self, self.address, self.handler)
 File "/usr/local/lib/python3.0/socketserver.py", line 401, in __init__
 self.server_activate()
 File "/usr/local/lib/python3.0/pydoc.py", line 1982, in 
server_activate
 if self.callback: self.callback(self)
 File "/usr/local/lib/python3.0/pydoc.py", line 2072, in ready
 text='Python documentation server at\n' + server.url)
 File "/usr/local/lib/python3.0/tkinter/__init__.py", line 1201, in 
configure
 return self._configure('configure', cnf, kw)
 File "/usr/local/lib/python3.0/tkinter/__init__.py", line 1192, in 
_configure
 self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
_tkinter.TclError: out of stack space (infinite loop?)