exit()函数会引发SystemExit异常,从而导致程序的退出。在普通的Python程序中,使用exit()函数可以立即终止程序的执行。 exit在while循环中的使用 在while循环中,我们可以通过捕获SystemExit异常来实现在循环中提前退出的效果。下面是一个简单的示例代码: whileTrue:try:user_input=input("Enter 'exit' to stop the loop...
if user_input == "exit":break else:print("你输入的内容不是"exit"，请重新输入！")```### 方法二：修改循环条件 可以通过在循环内部修改条件变量的值来结束`while`循环。```python condition = True while condition:# 执行循环体代码 # ...# 在某个时刻决定退出循环 condition = False ```### ...
while is the keyword that initiates the loop header. condition is an expression evaluated for truthiness that defines the exit condition. <body> consists of one or more statements to execute in each iteration.Here’s a quick example of how you can use a while loop to iterate over a ...
调用系统命令:quit()、exit() 后面会讲到,不建议大家使用。 关键字:continue 1.终止循环的第一个方法:改变条件,终止循环。(这里会引出一个标志位的概念) flag = True # 这个变量就是标志位,也可以理解为 while 循环体的标志位。 while flag: print('画') print('桥头姑娘') flag = False #标志位条件变...
') return bank, bet 更新主循环bet = 1 # to start loopwhile rcnt < 4 and bet: # exit loop if bet=0 rcnt = 0 bank,bet = total_bank(bank) if not bet: continue # exit game if bet = 0 guess = get_guess() if guess == rollDice(rcnt+1): bank += bet * 2 elif guess ==...
Exit the loop when i is 3: i =1 whilei <6: print(i) ifi ==3: break i +=1 Try it Yourself » ADVERTISEMENT The continue Statement With thecontinuestatement we can stop the current iteration, and continue with the next: Example ...
while True: user_input = input("Enter password: ") # terminate the loop when user enters exit if user_input == 'exit': print(f'Status: Entry Rejected') break print(f'Status: Entry Allowed') Output Enter password: Python is Fun Status: Entry Allowed Enter password: exit Status: Entry...
2,3,4]it=iter(list)# 创建迭代器对象whileTrue:try:print(next(it))exceptStopIteration:sys.exit(...
或0），就可以跳出了：count=1exit=1whileexit:print("出不来了")count+=1ifcount==6:exit=0...
whilecounter <=n: sum=sum+counter counter+=1 print("1 到 %d 之和为: %d"%(n,sum)) 执行结果如下: 1 1到100之和为:5050 无限循环 我们可以通过设置条件表达式永远不为 false 来实现无限循环,实例如下: 实例 1 2 3 4 5 6 7 8 #!/usr/bin/python3 ...