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<title>4.9.1.2 StreamWriter Objects
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4.9.1.2 StreamWriter Objects
The
<tt class=
"class">StreamWriter
</tt> class is a subclass of
<tt class=
"class">Codec
</tt> and
defines the following methods which every stream writer must define in
order to be compatible to the Python codec registry.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><span class=
"typelabel">class
</span> <tt id='l2h-
1007' xml:id='l2h-
1007'
class=
"class">StreamWriter
</tt></b>(
</nobr></td>
<td><var>stream
</var><big>[
</big><var>, errors
</var><big>]
</big><var></var>)
</td></tr></table></dt>
Constructor for a
<tt class=
"class">StreamWriter
</tt> instance.
All stream writers must provide this constructor interface. They are
free to add additional keyword arguments, but only the ones defined
here are used by the Python codec registry.
<var>stream
</var> must be a file-like object open for writing (binary)
The
<tt class=
"class">StreamWriter
</tt> may implement different error handling
schemes by providing the
<var>errors
</var> keyword argument. These
parameters are predefined:
<LI><code>'strict'
</code> Raise
<tt class=
"exception">ValueError
</tt> (or a subclass);
<LI><code>'ignore'
</code> Ignore the character and continue with the next.
<LI><code>'replace'
</code> Replace with a suitable replacement character
<LI><code>'xmlcharrefreplace'
</code> Replace with the appropriate XML
<LI><code>'backslashreplace'
</code> Replace with backslashed escape sequences.
The
<var>errors
</var> argument will be assigned to an attribute of the
same name. Assigning to this attribute makes it possible to switch
between different error handling strategies during the lifetime
of the
<tt class=
"class">StreamWriter
</tt> object.
The set of allowed values for the
<var>errors
</var> argument can
be extended with
<tt class=
"function">register_error()
</tt>.
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<td><nobr><b><tt id='l2h-
1008' xml:id='l2h-
1008'
class=
"method">write
</tt></b>(
</nobr></td>
<td><var>object
</var>)
</td></tr></table></dt>
Writes the object's contents encoded to the stream.
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<td><nobr><b><tt id='l2h-
1009' xml:id='l2h-
1009'
class=
"method">writelines
</tt></b>(
</nobr></td>
<td><var>list
</var>)
</td></tr></table></dt>
Writes the concatenated list of strings to the stream (possibly by
reusing the
<tt class=
"method">write()
</tt> method).
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<td><nobr><b><tt id='l2h-
1010' xml:id='l2h-
1010'
class=
"method">reset
</tt></b>(
</nobr></td>
<td><var></var>)
</td></tr></table></dt>
Flushes and resets the codec buffers used for keeping state.
Calling this method should ensure that the data on the output is put
into a clean state, that allows appending of new fresh data without
having to rescan the whole stream to recover state.
In addition to the above methods, the
<tt class=
"class">StreamWriter
</tt> must also
inherit all other methods and attribute from the underlying stream.
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<span class=
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2005.
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