[python]bytes和str

Python 3.6.1 (v3.6.1:69c0db5050, Mar 21 2017, 01:21:04)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a="Hello World"
>>> b=a.encode("utf-8")
>>> b
b‘Hello World‘
>>> b[0]
72
>>> b[:1]
b‘H‘
>>> a[0]
‘H‘
>>> a[:1]
‘H‘
>>> type(b[0])
<class ‘int‘>
>>> c = [i for i in range(10)]
>>> c
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> c[0]
0
>>> c[:1]
[0]
>>>