def mode(self, new_mode: str) -> None:
"""
Setter function for mode attribute - will only set mode initiatlly, cannot change file mode
:param new_mode: New mode
"""
if not hasattr(self, '__mode'):
if new_mode in self.HUFFMAN_FILE_MODES:
self.__mode = new_mode
else:
raise ValueError("Invalid file mode. Please select either \'rb\' or \'wb\'")
else:
raise _io.UnsupportedOperation("unable to change file mode")
def test_exception(self):
import _io
e = _io.UnsupportedOperation("seek")
def function_wrapper(*args, **kwargs):
if args[0].mode == 'rb':
text = func(*args, **kwargs)
return text
else:
raise _io.UnsupportedOperation("file not readable")
def function_wrapper(*args, **kwargs):
if args[0].mode == 'wb':
return_value = func(*args, **kwargs)
return return_value
else:
raise _io.UnsupportedOperation("file not writable")
def test_exception():
e = _io.UnsupportedOperation("seek")
def tell(self, *args):
raise _io.UnsupportedOperation("not seekable")