Python Python Loop 通常,当你遍历 Python 中的元素集合,比如列表,时,你还需要与每个元素相关联的序号。这样的数字通常称为索引 - index。在执行 foreach 循环时访问索引的 pythonic 方法是使用内置函数 enumerate()。enumerate() 向可迭代集合中的每个元素添加索引。然后,你可以使用 list() 内置函数来获取元组列表...
This first creates a range corresponding to the indexes in our list (0tolen(colors) - 1). We can loop over this range using Python’s for-in loop (really aforeach). This provides us with the index of each item in ourcolorslist, which is the same way that C-styleforloops work. T...
1.1 Python For Loop Example with String A string contains a sequence of characters so, we can iterate each character in a string using for loop. Here we have taken ‘Hello‘ as a string so, using for the statement we can iterate over each character in a string. For example, # Iterate ...
Remember to increase the index by 1 after each iteration.Example Print all items, using a while loop to go through all the index numbers thislist = ["apple", "banana", "cherry"]i = 0 while i < len(thislist): print(thislist[i]) i = i + 1 Try it Yourself » ...
for member in [a finite list of members]:statement # for loop body 列表必须是有限的，否则你会...
清单1 中显示了 for 循环的基本语法,还演示了如何在 for 循环中使用continue和break语句。 清单1. for 循环的伪代码 for item in container: if conditionA: # Skip this item continue elif conditionB: # Done with loop break # action to repeat for each item in the container ...
负for循环中的变量赋值 您没有为项指定初始值。这些不是循环的“典型”,但无论如何我都不会使用循环。 您只需要数组的值,因此可以使用数组函数: arr.forEach((item, index) => { // do something with item} 如果要以相反的顺序处理它们,可以使用一个反转功能来翻转端点: arr.reverse().forEach(() =>...
冒号最常用于 if、elif、else、while 和 for 语句以及函数定义(以 def 关键字开头)的末尾。 | | 定义 addTwoNumbers(a,b):"将两个数相加"返回 a + b | 在本例中,引号中的文本是一个 docsctring。这个文本是一个帮助(addTwoNumbers)命令在交互式解释器中显示的内容。 | | 如果 long_var 为真&& \...
Java 中的“While-loop” | C# 中的“For 循环” | Python 中的“For-loop” | | --- | --- | --- | | //让我们初始化一个变量 int I = 3;而(i > 0) {System.out.println("三个 hello ");-我;} | //这是一个迷人的循环for(int I = 0;我<3;i++){控制台。WriteLine(“你好!
Python3 is a high-level, interpreted programming language known for its readability and simplicity, making it a popular choice for both beginners and experienced developers. Plus it is versatile and cross-platform but in the end, it is a scripting language meaning that anybody with access to the...