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The Python standard library has many modules that provide networking facilities.

Low-level networking can be done using QAbstractSocket subclasses, including QTcpSocket, QTcpServer, and QUdpSocket, and from Qt 4.3, QSslSocket. In addition to Python's standard library, PyQt4 provides its own set of networking classes, including QFtp for client-side FTP support and QHttp for HTTP support. Most of Python's networking support is based on the socket module, which can be used directly for low-level network programming. The standard library also includes support for many other network protocols, including IMAP4, POP3, and SMTP for email, and NNTP for network news, as well as libraries for handling cookies, XML-RPC, and CGI, and for creating servers. And if Python has been installed with SSL support, the urllib2 module can use the HTTPS protocol. The urllib2 module supports basic authentication and can be used to set HTTP headers. They can use the FTP and HTTP protocols, in the latter case using GET or POST, and they can use an HTTP proxy. Python's urllib and urllib2 standard library modules are very versatile. For an HTTP download, the message is an httplib.HTTPMessage instance that contains the relevant HTTP headers. The name holds the name that the source was saved under it will be the same as target in this case, but if no target is specified it will be a generated name-for example, /tmp/. "pycrypto-2.0.1.tar.gz" target = source name, message = urllib.urlretrieve(source, target)