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URLError
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Error raised by handlers when a problem is detectedThis is a subclass of IOErrorThe reason attribute of the exception instance has more information about the problem This is defined in the urllib2 module in Python 2
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The urllibrobotparser module (robotparser in Python 2) is used to fetch and parse the contents of 'robotstxt' files used to instruct web crawlers Consult the online documentation for further usage information
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Notes
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Advanced users of the urllib package can customize its behavior in almost every way imaginableThis includes creating new kinds of openers, handlers, requests, protocols, etcThis topic is beyond the scope of what can be covered here, but the online documentation has some further details Users of Python 2 should take note that the urlliburlopen() function, which is in widespread use, is officially deprecated in Python 26 and eliminated in Python 3 Instead of using urlliburlopen(), you should use urllib2urlopen(), which provides the same functionality as urllibrequesturlopen() described here
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xmlrpc
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The xmlrpc package contains modules for implement XML-RPC servers and clients XML-RPC is a remote procedure call mechanism that uses XML for data encoding and HTTP as a transport mechanismThe underlying protocol is not specific to Python so programs using these modules can potentially interact with programs written in other languages More information about XML-RPC can be obtained at http://www xmlrpccom
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xmlrpcclient (xmlrpclib)
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The xmlrpcclient module is used to write XML-RPC clients In Python 2, this module is called xmlrpclibTo operate as a client, you create an instance of ServerProxy:
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ServerProxy(uri [, transport [, encoding [, verbose [, allow_none [, use_datetime]]]])
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uri is the location of the remote XML-RPC server for example, "http://www foocom/RPC2" If necessary, basic authentication information can be added to the URI using the format "http://user:pass@host:port/path", where user:pass is the
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username and passwordThis information is base-64 encoded and put in an
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'Authorization:' header on transport If Python is configured with OpenSSL support, HTTPS can also be used transport specifies a factory function for creating an
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internal transport object used for low-level communicationThis argument is only used if XML-RPC is being used over some kind of connection other than HTTP or HTTPS It is almost never necessary to supply this argument in normal use (consult the online documentation for details) encoding specifies the encoding, which is UTF-8 by default verbose displays some debugging information if True allow_none, if True, allows the value None to be sent to remote servers By default, this is disabled because it s not universally supported use_datetime is a Boolean flag that if set to True, uses the datetime module to represent dates and times By default, this is False An instance, s, of ServerProxy transparently exposes all the methods on the remote serverThe methods are accessed as attributes of s For example, this code gets the current time from a remote server providing that service:
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>>> s = ServerProxy("http://wwwxmlrpccom/RPC2") >>> scurrentTimegetCurrentTime() <DateTime u'20051102T20:08:24' at 2c77d8> >>>
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xmlrpc Package
For the most part, RPC calls work just like ordinary Python functions However, only a limited number of argument types and return values are supported by the XML-RPC protocol:
XML-RPC Type
boolean integer float string array structure dates binary
Python Equivalent
True and False
int float string or unicode (must only contain characters valid in XML) Any sequence containing valid XML-RPC types Dictionary containing string keys and values of valid types Date and time (xmlrpcclientDateTime) Binary data (xmlrpcclientBinary)
When dates are received, they are stored in an xmlrpcclientDateTime instance d The dvalue attribute contains the date as an ISO 8601 time/date stringTo convert it into a time tuple compatible with the time module, use dtimetuple()When binary data is received, it is stored in an xmlrpcclientBinary instance bThe bdata attribute contains the data as a byte string Be aware that strings are assumed to be Unicode and that you will have to worry about using proper encodings Sending raw Python 2 byte strings will work if they contain ASCII but will break otherwiseTo deal with this, convert to a Unicode string first If you make an RPC call with arguments involving invalid types, you may get a TypeError or an xmlrpclibFault exception If the remote XML-RPC server supports introspection, the following methods may be available:
ssystemlistMethods()