foreach item in iterableEvaluate conditionFalseTrueNext itemConditionBody 在这个状态图中,我们看到for循环的状态转换。循环从Start状态开始,进入Iteration状态,评估条件,如果条件为 True,就执行Body代码块,然后返回Iteration,直到条件为 False,循环结束。 结论 循环在 Python 编程中扮演着重要的角色,通过for和while循环,...
In the first statement,whileloop sets acondition, then astatement, and the compiler following the flow of execution, first checks the condition provided in the condition block, if the condition holdsTrue, then the statement is executed. 在第一个语句中,while循环设置一个condition,然后一个语句,然后...
Here, the condition of the while loop is alwaysTrue. However, if the user entersend, the loop termiantes because of thebreakstatement. Pythonwhileloop with anelseclause In Python, awhileloop can have an optionalelseclause - that is executed once the loop condition isFalse. For example, coun...
When programming in Python,forloops often make use of therange()sequence type as its parameters for iteration. Break statement with for loop The break statement is used to exit the for loop prematurely. It’s used to break the for loop when a specific condition is met. Let’s say we hav...
The basic loop structure in Python is while loop. Here is the syntax.Syntax:while (expression) : statement_1 statement_2 ...The while loop runs as long as the expression (condition) evaluates to True and execute the program block. The condition is checked every time at the beginning of...
When the if-else condition is used inside the loop, the interpreter checks the if condition in each iteration, and the correct block gets executed depending on the result. if condition: block of statements else: block of statements Example: Print all even and odd numbers In this program, for...
Python loop definition Aloopis a sequence of instructions that is continually repeated until a certain condition is reached. For instance, we have a collection of items and we create a loop to go through all elements of the collection. Loops in Python can be created withfororwhilestatements. ...
python first.py Windows:snipping tool (截图工具) the first thing we have in every programming language is what's calledreserved words(预定字). False class return is finally None if for lamdba continue True def from while nonlocal and del global not with ...
The While Loop In Python The while loop statement is used to repeat a block of code till a condition is fulfilled. When we don’t know the exact number of times, a loop statement has to be executed. We make use of while loops. This way, till the test expression holds true, the loo...
1."while"循环闭环：```pythonwhilecondition:#循环执行的代码块```在这个闭环中，首先检查条件是否为真。如果条件为真，则执行循环中的代码块，然后再次检查条件。如果条件为假，则退出循环。loop闭环使用方法 2."for"循环闭环：```pythonforiteminiterable:#循环执行的代码块```在这个闭环中，迭代遍历可迭代对象...