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Python学习笔记——从入门到报废(八、逻辑判断与分支结构(下))

  • 2026-03-14 18:22:10
Python学习笔记——从入门到报废(八、逻辑判断与分支结构(下))

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前文我们已经介绍了布尔计算逻辑,对布尔逻辑的具体应用之一——条件判断,本文将做讲解和说明。

如前面所说,我们想对不一样的条件做不同的代码设计,就好比面对不同的人说不同的话、撒不同的谎,汤是用来喝的而菜是用来吃的等。其实,代码本身是可以抽象成流程图的,且可以使用到流程图中的所有逻辑和变换,或者说代码就是流程图的具象表达,因此,其必然是能够做条件判断并实现分支结构的。

一、简单条件判断

Python提供了关键词“if”、“else”来用于条件判断,if表示某条件成立,else表示该条件不成立。

对于上面的流程图,使用代码就可表示为:

a = 5b = 1if a > 2 and b < 2:    a += 2    b -= 2else:    a -= 2    b += 2

需要十分注意,一是if后面需要跟条件判断语句或布尔值,布尔值可以是数字,若为数字,通常整数0表示False,非零表示True;二是Python是缩进敏感的编程语言,通常我们以4个空格为一个缩进单位(有的是2个空格),相邻且有相同缩进单位的代码行属于同一个代码块或同一个层级,而else只有与对应的if在同一层级, if条件成立时运行的代码也只有为if的子层级时(相较于if缩进一个单位),才会发挥正确的作用。

例如,若代码“b = b - 2”没有缩进,则其变为了与if、else在相同代码层级,这时不管条件如何“b = b - 2”都会执行;且由于else的前一行同级代码不是if,就会导致else本身不知道参与了哪一个比较条件,从而出现程序错误。

二、复杂条件判断

(1)多层判断

通常我们的条件判断不可能只有一层,例如下面的流程图,其有两个层级的条件判断:

其对应的代码为:

a, b = 51if a > 2 and b < 2:    a += 2    if b == 1:        b *= 3else:    a -= 2    b += 2

需要注意到代码缩进问题,由于“b = b * 3”是第二个if成立时执行,因此其必须在第二个if缩进的基础上再次缩进,以确保其在第二个if的代码块中执行。

不是所有的if语句都需要有else,而else必须对应一个if。

(2)连续判断

购票时,我们可能会遇到这样一件事:现有购票活动优惠,如果不满18岁,则免费;如果是老年人大于65岁,则半价;否则打8折。将购票过程转换为一个根据年龄(age)进行打折(discount)的过程,那么可以得到这样的流程图:

转换为Python代码,可以写为:

age = input("Customer's age: ")discount = 1.0if age < 18:    discount = 0else:    if age > 65:        discount = 0.5    else:        discount = 0.8

这样的写法没有错,但是能不能在“age < 18”不满足时,直接判断“age > 65”,绕过重复的else操作,就如同C/C++、Java当中的“else if”那样?答案是当然可以!

Python提供了一个名为“elif”的关键词,用来代替其他编程语言中的“else if”操作,这样,上述购票优惠的代码就可以改写为:

age = input("Customer's age: ")discount = 1.0if age < 18:    discount = 0elif age > 65:    discount = 0.5else:    discount = 0.8

通过例子,我们还可以看出,嵌套的条件判断其实可以使用“elif”来进行替换,从而减少代码的缩进层级,让代码更加易于浏览、理解和检查。

(3)三目运算(三元运算)

以上面购票的例子,如果我们不考虑老年人,只考虑是否成年,那么代码就要改写为:

age = input("Customer's age: ")discount = 1.0if age < 18:    discount = 0else:    discount = 0.8

会发现,实现了一个简单功能,却花费了5行代码完成,这是一个不必要的浪费。事实上,我们可以用一行代码完成这个操作,让代码简洁化:

discount = 0 if age < 18 else 0.8

这行代码的功能与上面的5行相同,但是却十分简洁。这个表达式就是三目运算或叫做三元运算,可以抽象的表达为:

target = expression_1 if condition else expression_2

在这里注意一个细节,表达式里使用的是“expression”(表达式),而非“value”(值),这说明三目运算不仅可以用来赋值操作,其同时可以完成一定程度的运算,例如:

y = x ** 2 if x > 0 else -x  # -x 表示取 x 的相反数

同时,由于是表达式,我们甚至可以实现三目运算的嵌套,例如:

target = exp_1 if cond_1 else (exp_2 if cond_2 else exp_3)

往期回顾:

Python学习笔记——从入门到报废(七、逻辑判断与分支结构(上))

Python学习笔记——从入门到报废(六、常用内置函数与顺序执行)

Python学习笔记——从入门到报废(五、变量和数据类型(下))

Python学习笔记——从入门到报废(四、变量和数据类型(上))

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  1. CONNECT:[ UseTime:0.000707s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000802s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010215s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002072s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000532s ]
  6. SELECT * FROM `set` [ RunTime:0.000185s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000514s ]
  8. SELECT * FROM `article` WHERE `id` = 474303 LIMIT 1 [ RunTime:0.000833s ]
  9. UPDATE `article` SET `lasttime` = 1773528334 WHERE `id` = 474303 [ RunTime:0.013891s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000240s ]
  11. SELECT * FROM `article` WHERE `id` < 474303 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000504s ]
  12. SELECT * FROM `article` WHERE `id` > 474303 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000348s ]
  13. SELECT * FROM `article` WHERE `id` < 474303 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001629s ]
  14. SELECT * FROM `article` WHERE `id` < 474303 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000701s ]
  15. SELECT * FROM `article` WHERE `id` < 474303 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000730s ]
0.100586s