>>> age=12 >>> if age < 4: ... price = 0 ... elif age < 18: ... price = 5 ... else: ... price = 10 ... >>> price 5
>>> str = [] >>> if str: ... a = 1 ... else: ... a = 0 ... >>> a 0
pyhton基础知识——if语句
原文：https://www.cnblogs.com/my16/p/15028626.html
