输出：print()
在Python2中：
>>> print('hello world')
hello world
>>> print('hello world')
hello world
>>> print 'hello world'
hello world
>>> print "hello world"
hello world
在Python3中：
>>> print 'hello world'
File "<stdin>", line 1
print 'hello world'
^
SyntaxError: Missing parentheses in call to 'print'
>>> print "hello world"
File "<stdin>", line 1
print "hello world"
^
SyntaxError: Missing parentheses in call to 'print'
>>> print("hello world")
hello world
>>> print('hello world')
hello world
>>>
在Python2中
>>> print('hello','world')
hello world
>>> print "hello","world"
hello world
在Python3中：
>>> print("print","world")
print world
>>> print "hello","world"
File "<stdin>", line 1
print "hello","world"
^
SyntaxError: Missing parentheses in call to 'print'
说明在Python3中，print一定得使用括号。
输入：input()
#!/usr/bin/env Python
# coding=utf-8
name = input("输入您的名称：")
print ("hello ,",name)
结果：
mobao$ python3 hello.py
输入您的名称：wxx
hello , wxx
