Python逻辑运算符:不懂and/or/not,你的代码还在原地转圈?
逻辑运算符用以使用的逻辑运算符, 采用这些逻辑运算符我们能够形成复合的布尔表达式, 这些逻辑运算符的每一个操作数其本身就是一个布尔表达式, 比如。age16 and marks80 percentage50 or attendance75和关键字False一起, 把None、各类数值零、空序列字符串、元组、列表、空字典以及空集合解释成False。所有别的值都被视作True。有三个用于逻辑运算的符号, 这三个符号它们叫做, “and”, 还有那个“or”, 以及“not”, 并且这三个符号必须采用小写形式来书写。and运算符对于复合布尔表达式而言, 仅当两个操作数全都为True之际, 表达式方才为True, 要是一个操作数或者两个操作数之中有一个为False, 表达式便返回False, 下表呈现了各种情形。aba and bor运算符比较起来, 要是任意一个操作数是True, or运算符就会返回True。就复合布尔表达式而言, 要成为False, 两个操作数均得是False, 像下表所显示的那样: -。aba or b逻辑 not 运算符这乃是一个一元运算符, , 它具备这样的影响, , 即将紧随其后的布尔操作数的状态予以反转, , 所以, , not True转变成为False, , not False演化为True。anot (a)解释器如何评估逻辑运算符有关表达式x and y, 首先会对“x”展开评估。要是“x”呈现为假的状态, 那么就会返回它的值然而, 要是不属于这种情况的话即“x”为真, 便会去评估“y”随后予以返回结果值。首先对表达式“x或y”进行计算之“x”, 若“x”是为真的情形, 那么就返回其值, 不然的话, 计算“y”然后返回所得到的值。下面给出了逻辑运算符的一些使用情况−x 10 y 20 print(x 0 and x 10:,x 0 and x 10) print(x 0 and y 10:,x 0 and y 10) print(x 10 or y 10:,x 10 or y 10) print(x%2 0 and y%2 0:,x%2 0 and y%2 0) print (not (xy15):, not (xy)15)它将产生以下输出。x 0 and x 10: False x 0 and y 10: True x 10 or y 10: True x%2 0 and y%2 0: True not (xy15): False能够应用非布尔操作数的那个范围内, 包含著逻辑运算符之地。于此情形下, 请留意任何并非为零的数字以及并非为空的序列, 它们均会被视作真实的状况。所以呢, 逻辑运算符所具备的真值表, 同样适用于这些具体的情形之中。在下面这个例子里头, 逻辑运算符运用的是数值操作数。变量“x”的值是为真, 变量“y”的值同样是为真, 而变量“z”的值则是为假。x 10 y 20 z 0 print(x and y:,x and y) print(x or y:,x or y) print(z or x:,z or x) print(y or z:, y or z)它将会产生以下 输出-x and y: 20 x or y: 10 z or x: 10 y or z: 20下面的示例里, 字符串变量被当作True, 空元组被视作假。aHello btuple() print(a and b:,a and b) print(b or a:,b or a)它将产生以下输出 输出 −a and b: () b or a: Hello最终, 接下来二者所呈现的两个列表对象均并非等于空值。所以, x以及y返回的是那个后者, x或者y返回的却是那个前者。x[1,2,3] y[10,20,30] print(x and y:,x and y) print(x or y:,x or y)它将产生以下输出x and y: [10, 20, 30] x or y: [1, 2, 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