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从零学Python之入门(四)运算

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Release: 2016-06-06 11:30:39
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Python的运算符和其他语言类似

(我们暂时只了解这些运算符的基本用法,方便我们展开后面的内容,高级应用暂时不介绍)

数学运算

代码如下:


>>>print 1+9        # 加法

>>>print 1.3-4      # 减法

>>>print 3*5        # 乘法

>>>print 4.5/1.5    # 除法

>>>print 3**2       # 乘方    

>>>print 10%3       # 求余数

判断

判断是真还是假,返回True/False

代码如下:


>>>print 5==6               # =, 相等

>>>print 8.0!=8.0           # !=, 不等

>>>print 3

>>>print 4>5, 4>=0          # >, 大于; >=, 大于等于

>>>print 5 in [1,3,5]       # 5是list [1,3,5]的一个元素

还有is, is not等, 暂时不深入)


逻辑运算

True/False之间的运算

代码如下:


>>>print True and True, True and False      # and, “与”运算, 两者都为真才是真

>>>print True or False                      # or, "或"运算, 其中之一为真即为真

>>>print not True                           # not, “非”运算, 取反

可以和上一部分结合做一些练习,比如:

代码如下:


>>>print 5==6 or 3>=3

总结

数学 +, -, *, /, **, %

判断 ==, !=, >, >=,

逻辑 and, or, not

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