Re: Cleanup guarantees?
* Gabriel Genellina: En Fri, 09 Apr 2010 01:13:37 -0300, Alf P. Steinbach escribió: > > import urllib.request # urlopen > import codecs # getreader > import sys # stderr > > def text_stream_from( url, encoding ): > text_reader = codecs.getreader( encoding ) > connection = urllib.request.urlopen( url ) > return text_reader( connection ) > > def list_text( url, encoding ): > lines = text_stream_from( url, encoding ) > for line in lines: > print( line, end = "" ) > lines.close() # Undocumented? > > url = "http://www.rfc-editor.org/rfc/rfc1149.txt"; > list_text( url, "ascii" ) > > > First, I'm unable to find documentation that there /is/ a close method in the > text_reader object, and I'm unable to find documentation that there is a close > method in the file like connection object; is there such documentation? codecs.getreader returns a StreamReader instance (see [1]) StreamReader is documented here [2] and it says "In addition to the above methods, the StreamReader must also inherit all other methods and attributes from the underlying stream." -- the stream being 'connection', from urllib.request.urlopen. The 3.x version of the documentation in [3] doesn't provide any details except being "a file-like object". The 2.x version [4] is much more clear: "a file-like object is returned. This supports the following methods: read(), readline(), readlines(), fileno(), close(), info(), getcode() and geturl(). It also has proper support for the iterator protocol." [1] http://docs.python.org/py3k/library/codecs.html#codecs.getreader [2] http://docs.python.org/py3k/library/codecs.html#codecs.StreamReader [3] http://docs.python.org/py3k/library/urllib.request.html#urllib.request.urlopen [4] http://docs.python.org/library/urllib.html#urllib.urlopen Thanks. > Second, I'm unable to find documentation of when they're called and what they > do. It seems that (A) when the connection object's st method is called automatically, and (B) that when the > text_reader object's close method is called it calls the close method of the > wrapped stream (i.e. on the connection object). But where is this documented? Nowhere, AFAIK. I bet documentation patches are welcome. Well, I think I know too little about intentions to do any documentation patches. Cheers, - Alf -- http://mail.python.org/mailman/listinfo/python-list
Re: Cleanup guarantees?
En Fri, 09 Apr 2010 01:13:37 -0300, Alf P. Steinbach escribió: > > import urllib.request # urlopen > import codecs # getreader > import sys # stderr > > def text_stream_from( url, encoding ): > text_reader = codecs.getreader( encoding ) > connection = urllib.request.urlopen( url ) > return text_reader( connection ) > > def list_text( url, encoding ): > lines = text_stream_from( url, encoding ) > for line in lines: > print( line, end = "" ) > lines.close() # Undocumented? > > url = "http://www.rfc-editor.org/rfc/rfc1149.txt"; > list_text( url, "ascii" ) > > > First, I'm unable to find documentation that there /is/ a close method in the > text_reader object, and I'm unable to find documentation that there is a close > method in the file like connection object; is there such documentation? codecs.getreader returns a StreamReader instance (see [1]) StreamReader is documented here [2] and it says "In addition to the above methods, the StreamReader must also inherit all other methods and attributes from the underlying stream." -- the stream being 'connection', from urllib.request.urlopen. The 3.x version of the documentation in [3] doesn't provide any details except being "a file-like object". The 2.x version [4] is much more clear: "a file-like object is returned. This supports the following methods: read(), readline(), readlines(), fileno(), close(), info(), getcode() and geturl(). It also has proper support for the iterator protocol." [1] http://docs.python.org/py3k/library/codecs.html#codecs.getreader [2] http://docs.python.org/py3k/library/codecs.html#codecs.StreamReader [3] http://docs.python.org/py3k/library/urllib.request.html#urllib.request.urlopen [4] http://docs.python.org/library/urllib.html#urllib.urlopen > Second, I'm unable to find documentation of when they're called and what they > do. It seems that (A) when the connection object's st method is called automatically, and (B) that when the > text_reader object's close method is called it calls the close method of the > wrapped stream (i.e. on the connection object). But where is this documented? Nowhere, AFAIK. I bet documentation patches are welcome. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Cleanup guarantees?
On 04/09/10 05:13, Alf P. Steinbach wrote: Second, I'm unable to find documentation of when they're called and what they do. It seems that (A) when the connection object's stream is exhausted by reading, its close() method is called automatically, and (B) that when the text_reader object's close method is called it calls the close method of the wrapped stream (i.e. on the connection object). But where is this documented? If nothing else, my guess would be the source somewhere between the urllib and socket module. -- mph -- http://mail.python.org/mailman/listinfo/python-list
Cleanup guarantees?
Consider ... import urllib.request # urlopen import codecs # getreader import sys # stderr def text_stream_from( url, encoding ): text_reader = codecs.getreader( encoding ) connection = urllib.request.urlopen( url ) return text_reader( connection ) def list_text( url, encoding ): lines = text_stream_from( url, encoding ) for line in lines: print( line, end = "" ) lines.close() # Undocumented? url = "http://www.rfc-editor.org/rfc/rfc1149.txt"; list_text( url, "ascii" ) First, I'm unable to find documentation that there /is/ a close method in the text_reader object, and I'm unable to find documentation that there is a close method in the file like connection object; is there such documentation? Second, I'm unable to find documentation of when they're called and what they do. It seems that (A) when the connection object's stream is exhausted by reading, its close() method is called automatically, and (B) that when the text_reader object's close method is called it calls the close method of the wrapped stream (i.e. on the connection object). But where is this documented? Cheers, - Alf -- http://mail.python.org/mailman/listinfo/python-list
