bytearray([source [, encoding [, errors]]])

中文說明：

bytearray([source [, encoding [, errors]]])返回一個byte數組。Bytearray類型是一個可變的序列，并且序列中的元素的取值范圍為 [0 ,255]。

參數source:

如果source為整數，則返回一個長度為source的初始化數組；

如果source為字符串，則按照指定的encoding將字符串轉換為字節序列；

如果source為可迭代類型，則元素必須為[0 ,255]中的整數；

如果source為與buffer接口一致的對象，則此對象也可以被用于初始化bytearray.。

版本：在python2.6后新引入，在python3中同樣可以使用！

英文說明:

Return a new array of bytes. The bytearray type is a mutable sequence of integers in the range 0 <= x < 256. It has most of the usual methods of mutable sequences, described in Mutable Sequence Types, as well as most methods that the str type has, see String Methods.

The optional source parameter can be used to initialize the array in a few different ways:

If it is a string, you must also give the encoding (and optionally, errors) parameters; bytearray() then converts the string to bytes using str.encode().

If it is an integer, the array will have that size and will be initialized with null bytes.

If it is an object conforming to the buffer interface, a read-only buffer of the object will be used to initialize the bytes array.

If it is an iterable, it must be an iterable of integers in the range 0 <= x < 256, which are used as the initial contents of the array.

Without an argument, an array of size 0 is created.

New in version 2.6.

實例演示：

>>> a = bytearray(3)
>>> a
bytearray(b'x00x00x00')
>>> a[0]
 
>>> a[1]
 
>>> a[2]
 
>>> b = bytearray("abc")
>>> b
bytearray(b'abc')
>>> b[0]
 
>>> b[1]
 
>>> b[2]
 
>>> c = bytearray([1, 2, 3])
>>> c
bytearray(b'x01x02x03')
>>> c[0]
 
>>> c[1]
 
>>> c[2]
 
>>> d = bytearray(buffer("abc"))
>>> d
bytearray(b'abc')
>>> d[0]
 
>>> d[1]
 
>>> d[2]

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