readline([size[, keepends]]) Read one line from the input stream and return the decoded data. size, if given, is passed as size argument to the stream’s read() method. If keepends is false line-endings will be stripped from the lines returned.

read([size[, chars[, firstline]]]) Decodes data from the stream and returns the resulting object. The chars argument indicates the number of decoded code points or bytes to return. The read() method will never return more data than requested, but it might return less, if there is not enough available. The size argument indicates the approximate maximum number of encoded bytes or code points to read for decoding. The decoder can modify this setting as appropriate. The default value -1 indicat

class codecs.StreamReader(stream, errors='strict') Constructor for a StreamReader instance. All stream readers must provide this constructor interface. They are free to add additional keyword arguments, but only the ones defined here are used by the Python codec registry. The stream argument must be a file-like object open for reading text or binary data, as appropriate for the specific codec. The StreamReader may implement different error handling schemes by providing the errors keyword arg

codecs.replace_errors(exception) Implements the 'replace' error handling (for text encodings only): substitutes '?' for encoding errors (to be encoded by the codec), and '\ufffd' (the Unicode replacement character) for decoding errors.

codecs.register_error(name, error_handler) Register the error handling function error_handler under the name name. The error_handler argument will be called during encoding and decoding in case of an error, when name is specified as the errors parameter. For encoding, error_handler will be called with a UnicodeEncodeError instance, which contains information about the location of the error. The error handler must either raise this or a different exception, or return a tuple with a replacemen

codecs.register(search_function) Register a codec search function. Search functions are expected to take one argument, being the encoding name in all lower case letters, and return a CodecInfo object. In case a search function cannot find a given encoding, it should return None. Note Search function registration is not currently reversible, which may cause problems in some cases, such as unit testing or module reloading.

codecs.open(filename, mode='r', encoding=None, errors='strict', buffering=1) Open an encoded file using the given mode and return an instance of StreamReaderWriter, providing transparent encoding/decoding. The default file mode is 'r', meaning to open the file in read mode. Note Underlying encoded files are always opened in binary mode. No automatic conversion of '\n' is done on reading and writing. The mode argument may be any binary mode acceptable to the built-in open() function; the 'b'

codecs.namereplace_errors(exception) Implements the 'namereplace' error handling (for encoding with text encodings only): the unencodable character is replaced by a \N{...} escape sequence. New in version 3.5.

codecs.lookup_error(name) Return the error handler previously registered under the name name. Raises a LookupError in case the handler cannot be found.

codecs.lookup(encoding) Looks up the codec info in the Python codec registry and returns a CodecInfo object as defined below. Encodings are first looked up in the registry’s cache. If not found, the list of registered search functions is scanned. If no CodecInfo object is found, a LookupError is raised. Otherwise, the CodecInfo object is stored in the cache and returned to the caller.