Linux上Python IDE炸裂推荐！for i in range()别再手动数数了
中的for i in range()函数详解
中, for循环是一种用作遍历可迭代对象（像列表、元组、字典、字符串等）较重要的控制流结构 , range()函数是常与for循环搭配起来使用的函数, 用于成一个定下范围的数字序列。
当中的for i in range()函数的使用方法, 会在本文里被详细介绍, 其特点也会被剖析出来, 并且还将进行一些实例演示, 以此使大家能深入去了解这个常用的函数。
1. range()函数的基本语法
range()函数, 被用来生成一个数字序列, 这个数字序列处于指定范围之内, 它的基本语法是下面这样的:
range(start, stop, step)2. range()函数的特点
当运用for i in range()之际, range()函数展现出如下这般几个特性:
range()所生成的乃是一个不可被改变的序列, 其值无法直接被修改。range()函数所生成的序列属于一个左闭右开的区间, 也就是涵盖起始值, 然而却不涵盖终止值。range()函数对负数步长予以支持,能够运用其来生成递减的序列。3. range()函数的运用方法3.1 仅仅针对性地指定终止值。
for i in range(5): print(i)运行结果：
0 1 2 3 43.2 指定起始值和终止值
for i in range(2, 6): print(i)运行结果：
2 3 4 53.3 指定起始值、终止值和步长
for i in range(1, 10, 2): print(i)运行结果：
1 3 5 7 93.4 倒序遍历序列
for i in range(10, 0, -1): print(i)运行结果：
10 9 8 7 6 5 4 3 2 14. 在4.1中, 针对遍历列表索引和元素这种情况, 存在着for i in range()的常见应用场景。
fruits = ['apple', 'banana', 'cherry'] for i in range(len(fruits)): print(i, fruits[i])运行结果：
0 apple 1 banana 2 cherry4.2 构造指定长度的列表
n = 5 nums = [i for i in range(n)] print(nums)运行结果：
[0, 1, 2, 3, 4]4.3 多重循环遍历
for i in range(3): for j in range(2): print(i, j)运行结果：
0 0 0 1 1 0 1 1 2 0 2 15. 总结
经由本文之中的介绍, 我们知悉了其中for i in range()函数的基础语法, 其特点, 以及常见的运用方法。将这个函数掌握妥当, 能够助力我们更为灵便地开展循环遍历, 并且生成指定范围的数字序列。WwW.HoUniAoHaO.CoM/AuSt/60034.html
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