headers Holds an instance of the class specified by the MessageClass class variable. This instance parses and manages the headers in the HTTP request. The parse_headers() function from http.client is used to parse the headers and it requires that the HTTP request provide a valid RFC 2822 style header.

Template.append(cmd, kind) Append a new action at the end. The cmd variable must be a valid bourne shell command. The kind variable consists of two letters. The first letter can be either of '-' (which means the command reads its standard input), 'f' (which means the commands reads a given file on the command line) or '.' (which means the commands reads no input, and hence must be first.) Similarly, the second letter can be either of '-' (which means the command writes to standard output), '

IMAP4.recent() Prompt server for an update. Returned data is None if no new messages, else value of RECENT response.

math.nan A floating-point “not a number” (NaN) value. Equivalent to the output of float('nan'). New in version 3.5.

FTP.getwelcome() Return the welcome message sent by the server in reply to the initial connection. (This message sometimes contains disclaimers or help information that may be relevant to the user.)

gc.get_objects() Returns a list of all objects tracked by the collector, excluding the list returned.

class tkinter.tix.DirList The DirList widget displays a list view of a directory, its previous directories and its sub-directories. The user can choose one of the directories displayed in the list or change to another directory.

class lzma.LZMACompressor(format=FORMAT_XZ, check=-1, preset=None, filters=None) Create a compressor object, which can be used to compress data incrementally. For a more convenient way of compressing a single chunk of data, see compress(). The format argument specifies what container format should be used. Possible values are: FORMAT_XZ: The .xz container format. This is the default format. FORMAT_ALONE: The legacy .lzma container format. This format is more limited than .xz – it d

CacheFTPHandler.setMaxConns(m) Set maximum number of cached connections to m.

curses.initscr() Initialize the library. Return a WindowObject which represents the whole screen. Note If there is an error opening the terminal, the underlying curses library may cause the interpreter to exit.