Python comes with two inbuilt keywords to interrupt loop iteration,breakandcontinue. Break Keyword In While loop The break keyword immediately terminates the while loop. Let's add a break statement to our exist
现在我们来看一个新的循环: while-loop。只要一个布尔表达式是 True,while-loop 就会一直执行它下面的代码块。 等等,你应该能理解这些术语吧?如果我们写一行以 : 结尾的代码,它就会告诉 Python 开始一个新的代码块。我们用这种方式来结构化你的程序,以便 Python 明白你的意图。如果你还没有掌握这块内容,先回去复...
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...
importselect# 创建一个select对象selector=select.select([sys.stdin],[],[])# 循环等待输入whileTrue:# 等待输入ready_to_read,_,_=selector.select()# 如果有数据可读ifready_to_read:# 读取输入command=raw_input().lower()# 处理输入ifcommand=="commands":print'"look around"'print'"explore"'print...
How to use while loops in Python The Python while loop can be used to execute a block of code for as long as a certain condition is fulfilled. While loops are primarily used in Python when the number of iterations can’t be determined at the time of writing the code. Keep reading to...
While loop Loops are used to repeatedly execute a block of program statements. 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...
ExampleGet your own Python Server Print i as long as i is less than 6: i =1 whilei <6: print(i) i +=1 Try it Yourself » Note:remember to increment i, or else the loop will continue forever. Thewhileloop requires relevant variables to be ready, in this example we need to def...
/usr/bin/python3 var = 1 while var == 1 : # This constructs an infinite loop num = int(input("Enter a number :")) print ("You entered: ", num) print ("Good bye!") 当执行上面的代码,它产生以下结果 - Enter a number :20 You entered: 20 Enter a number :29 You entered: 29 ...
Python3 循环语句 Python中的循环语句有 for 和 while。 Python循环语句的控制结构图如下所示: 一、while循环 Python 中 while语句 的一般形式: while 判断条件: 语句 1. 2. 注意冒号和缩进。另外,在Python中没有 do…while 循环。 实例(使用了 while 来计算 1 到 100 的总和) ...
译自 How (and When) to Use a Python While Loop，作者 Jack Wallen。While 循环是编程的一个基本要素。While 循环所做的是继续执行一条语句（或一组语句），直到满足特定条件。一个显而易见的例子（许多人都会理解）可能是这样的：只要我的银行账户有钱，我就可以买东西。该语句是我可以买东西，条件是只要...