Enter 'quit' to end the program. Hello again. Hello again. Tell me something, and I will repeat it back to you: Enter 'quit' to end the program. quit quit 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 这个程序很好,唯一美中不足的是,它将单词’quit’ 也作为一条消息打印了出来。为...
Terminate a Program Using the quit() Function Thequit()function is an inbuilt function that you can use to terminate a program in python. When thequit()function is executed, it raises theSystemExitexception. This results in the termination of the program. You can observe this in the following...
>>>spam=True # ➊>>>spam True>>>true# ➋Traceback(most recent call last):File"<pyshell#2>",line1,in<module>trueNameError:name'true'is not defined>>>True=2+2# ➌SyntaxError:can't assign to keyword 像任何其他值一样,布尔值在表达式中使用,并且可以存储在变量 ➊ 中。如果你没有...
# If the input file does not exist, the program terminates early: if not os.path.exists(inputFilename): print('The file %s does not exist. Quitting...' % (inputFilename)) sys.exit() # If the output file already exists, give the user a chance to quit: if os.path.exists(outputFi...
How would you terminate a script in Python? Which Python command to exit program would you prefer and why? Which Python command to exit program would you use in production code? When is os._exit() used? What message will you get if you print quit() or exit()? Is there a difference...
prompt +="\nEnter 'quit' to end the program." active = True while active: message = input(prompt) if message == 'quit': active = False else: print(message) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 2.4 使用 break 退出循环 ...
ifs=='quit': break iflen(s) <3: continue print'Input is of sufficient length' # Do other kinds of processing here... 在这个程序中,我们从用户处取得输入,但是我们仅仅当它们有至少3个字符长的时候才处理 它们。所以,我们使用内建的len函数来取得长度。如果长度小于3,我们将使用continue语句 忽略块中...
while True: var = raw_input("Enter something, or 'q' to quit): print var if var == 'q': break 关于这个脚本有两个细节需要注意:首先,在 Python 2.x 中,命令raw_input用于从用户那里获取输入。在 Python 3.x 中,这个命令被简单地改成了input。第二,记住break的命令。这个命令实际上打破了您...
Enter something : quit 要注意 continue 语句同样能用于 for 循环。 函数 函数(Functions)是指可重复使用的程序片段。 函数可以通过关键字 def 来定义。这一关键字后跟一个函数的标识符名称,再跟一对圆括号,其中可以包括一些变量的名称,再以冒号结尾,结束这一行。随后而来的语句块是函数的一部分...
prompt = "\nTell us your age:" prompt += "\nEnter 'quit' to end the program.\n\t" while True: age = input(prompt) if age == 'quit': break else: age = int(age) if age < 3: print('For children under 3, Free.') elif age <= 12: print('10 dollars for children betwee...