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tj�|�S | tkrtj�|d�S t�)a Convert the textual form of a network address into its binary form.
*family* is an ``int``, the address family.
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Returns a ``bytes``.
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tj�|�S | tkrtj�|�S t�)a0 Convert the binary form of a network address into its textual form.
*family* is an ``int``, the address family.
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implemented.
Returns a ``str``.
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r c C sN z t j�| � tW S ty& z t j�| d� tW Y S ty% t�w w )z�Determine the address family of a textual-form network address.
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