exception SystemError Raised when the interpreter finds an internal error, but the situation does not look so serious to cause it to abandon all hope. The associated value is a string indicating what went wrong (in low-level terms). You should report this to the author or maintainer of your Python interpreter. Be sure to report the version of the Python interpreter (sys.version; it is also printed at the start of an interactive Python session), the exact error message (the exception’s associ

match.groups(default=None) Return a tuple containing all the subgroups of the match, from 1 up to however many groups are in the pattern. The default argument is used for groups that did not participate in the match; it defaults to None. For example: >>> m = re.match(r"(\d+)\.(\d+)", "24.1632") >>> m.groups() ('24', '1632') If we make the decimal place and everything after it optional, not all groups might participate in the match. These groups will default to None unless

exception tarfile.CompressionError Is raised when a compression method is not supported or when the data cannot be decoded properly.

errors A list containing 2-tuples of TestCase instances and strings holding formatted tracebacks. Each tuple represents a test which raised an unexpected exception.

class io.TextIOBase Base class for text streams. This class provides a character and line based interface to stream I/O. There is no readinto() method because Python’s character strings are immutable. It inherits IOBase. There is no public constructor. TextIOBase provides or overrides these data attributes and methods in addition to those from IOBase: encoding The name of the encoding used to decode the stream’s bytes into strings, and to encode strings into bytes. errors The error

listen(backlog) Listen for connections made to the socket. The backlog argument specifies the maximum number of queued connections and should be at least 1; the maximum value is system-dependent (usually 5).

email.iterators.body_line_iterator(msg, decode=False) This iterates over all the payloads in all the subparts of msg, returning the string payloads line-by-line. It skips over all the subpart headers, and it skips over any subpart with a payload that isn’t a Python string. This is somewhat equivalent to reading the flat text representation of the message from a file using readline(), skipping over all the intervening headers. Optional decode is passed through to Message.get_payload.

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logging.addLevelName(lvl, levelName) Associates level lvl with text levelName in an internal dictionary, which is used to map numeric levels to a textual representation, for example when a Formatter formats a message. This function can also be used to define your own levels. The only constraints are that all levels used must be registered using this function, levels should be positive integers and they should increase in increasing order of severity. Note If you are thinking of defining you

csvreader.dialect A read-only description of the dialect in use by the parser.