python学习5：if判断语句

 代码如下：

result = input('give your result:')

if result == '4':
    print ("result is 4")
elif result == '5':
    print ("result is 5")
elif result == '6':
    print ("result is 6")
else:
    print ("result is wrong")

 运行结果如下：

=================== RESTART: C:/Users/公有制/Desktop/four.py ===================
give your result:4
result is wrong
>>> 
=================== RESTART: C:/Users/公有制/Desktop/four.py ===================
give your result:4
result is 4
>>> 
=================== RESTART: C:/Users/公有制/Desktop/four.py ===================
give your result:6
result is 6
>>>

可以发现，开始输入4，输出却是“result is wrong”，所以有点问题，问题是：if判断里面没有给4加‘’导致的，需要给它加一个单引号。

另外，由于python2和python3的兼容性问题，会出现Missing parentheses in call to 'print'的错误，原因是python3的编译器上编译python2的代码，因为Python3中print打印是要加括号的，不得不吐槽，python这兼容性有点差。