input()与raw_input()

1.用input()时候输入的会默认是合法Python表达式，当输入35时候会认为是数字

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2.用raw_input()时候会把输入当作原始数据，当输入35时会认为是‘35’

3.另一个例子：

name = input("What is your name?")
print "Hello,"+ name

运行结果：
What is your name?lk

Traceback (most recent call last):
  File "C:/Users/Admin/Desktop/q.py", line 1, in <module>
    name = input("What is your name?")
  File "<string>", line 1, in <module>
NameError: name 'lk' is not defined

name = raw_input("What is your name?")
print "Hello,"+ name

运行结果：
What is your name?lk
Hello,lk