bytearray error (an integer is required)

If you see this error: "TypeError: an integer is required" when you use bytearray, it means you can't use string for bytearray anymore.

Bytearray was introduced in python 3.0, it was back-ported to 2.6, in Python 2.6 and 3.0, you can use string:
#in 2.6 or 3.0

>>> a = bytearray()
>>> a.extend("hello")
>>> a
bytearray(b'hello')

But in Python 3.2, it won't work anymore, you have to use list of integers:

>>> a = bytearray()
>>> a.extend("hello")
Traceback (most recent call last):
File "", line 1, in
TypeError: an integer is required
>>> a.extend(b'hello') #this is OK
#if you have to use a string, use str.encode()
>>> a.extend("hello".encode()) # or list(map(ord,"hello")) or [ord(e) for e in "hello"]