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d � Z dS ) z*Generic Internet address helper functions.� Ni' c C s0 | t krtjj|�S | tkr(tjj|�S t�dS )a* Convert the textual form of a network address into its binary form.
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c C s0 | t krtjj|�S | tkr(tjj|�S t�dS )a/ Convert the binary form of a network address into its textual form.
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rF yt jj| � tS t�Y nX Y nX dS )z�Determine the address family of a textual-form network address.
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