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...
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 the loop and the first time when the expression evaluates to False, the loop stops without executing any remaining statement(s). ...
The infinite loop is a special kind of while loop; it never stops running. Its condition always remains True. An example of an infinite loop: while 1==1: print("In the loop") This program would indefinitely print "In the loop". You can stop the program's execution by using the Ctrl...
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 find out how the Python while loop works. Tip Teach yourself how to program in Python with our Python tutorial. What is the while loop in ...
Get Started With Python Your First Python Program Python Comments Python Fundamentals Python Variables and Literals Python Type Conversion Python Basic Input and Output Python Operators Python Flow Control Python if...else Statement Python for Loop Python while Loop Python break and continue Python pass...
'async', 'await', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal', 'not', 'or', 'pass', 'raise', 'return', 'try', 'while', 'with', 'yield'] >...
所以,你知道单个指令的基本原理,程序就是一系列指令。但是编程的真正优势不仅仅是像周末跑腿一样一个接一个地运行指令。根据表达式的求值方式,程序可以决定跳过指令,重复指令,或者从几条指令中选择一条来运行。事实上,你几乎从来不希望你的程序从第一行代码开始,简单
i=1whilei<=5:ifi%2==0:i+=1continueprint(i)i+=1 1. 2. 3. 4. 5. 6. 7. 上述代码会输出: 1 3 5 1. 2. 3. 序列图示例 下面是一个使用mermaid语法绘制的序列图,展示了在循环中跳过一次的过程: ProgramUserProgramUserloop[until i > 5]开始循环i = 1判断条件i = 1输出ii = 2跳过i...
# Simple pygame program # Import and initialize the pygame libraryimportpygame pygame.init()# Set up the drawing window screen=pygame.display.set_mode([500,500])# Run until the user asks to quit running=Truewhilerunning:# Did the user click the window close button?foreventinpygame.event.get...
On the command line, you might be used to starting a program with a single string:Shell $ python timer.py 5 However, with run() you need to pass the command as a sequence, as shown in the run() example. Each item in the sequence represents a token which is used for a system ...