def open(self, mode='rb'):
try:
if 'r' in mode:
if self.s is not None:
if 'b' in mode:
self.buffer = BytesIO(self.s)
else:
self.buffer = StringIO(self.s)
else:
raise ArgumentError('no string data supplied')
elif 'w' in mode:
if self.buffer is not None:
self.buffer.close()
if 'b' in mode:
self.buffer = BytesIO()
else:
self.buffer = StringIO()
elif 'a' in mode:
if self.buffer is None:
if 'b' in mode:
self.buffer = BytesIO()
else:
self.buffer = StringIO()
yield Uncloseable(self.buffer)
except:
raise
finally:
pass # don't close the buffer
