break语句用于结束整个循环。示例1:for i in range(5): print("---") print(i) #输出结果为: --- 0 --- 1 --- 2 --- 3 --- 4示例2:for i in range(5): i+=1 print("---") #当i的值等于3,则执行break语句,结束循环 if i == 3: break print(i) # 输出结果为: --- 1 ...
'fieldValues = eg.multpasswordbox(errmsg, title, fieldNames, fieldValues)elif fieldValues[1].strip() == "":errmsg = '密码不可为空!'fieldValues = eg.multpasswordbox(errmsg, title, fieldNames, fieldValues)else:breakprint("账号、密码分别为: %s" % fieldValues) 19. 多项选择框multchoicebox mul...
记住,for..in循环对于任何序列都适用。这里我们使用的是一个由内建range函数生成的数的列 表,但是广义说来我们可以使用任何种类的由任何对象组成的序列! break语句 #!/usr/bin/python # Filename: break.py while True: s=input('Enter something : ') ifs=='quit': break print('Length of the string i...
do-while语句:采用do-while语句,适合于先循环,后判断循环条件的情况,一般在循环体的执行过程中明确循环 控制条件。他每执行一次循环体后,再判断条件,已决定是否进行下一次循环。 break语句和continue语句:break语句强调循环结束,一旦执行了break语句,循环提前结束,不再执行循环体中 位于其后的其他语句. continue语句的作...
Local computer: set a breakpoint in the code where you want to start debugging. Local computer: start the VS Code debugger using the modifiedPython Debugger: Attachconfiguration and the Start Debugging button. VS Code should stop on your locally set breakpoints, allowing you to step through the...
if a method is called with the wrong number of arguments, an exception will be raised. This is extremely important as refactors happen. As a library changes, tests break and that is expected. Without using an auto-spec, our tests will still pass even though the underlying implementation is...
By checking for specific types in your code, you effectively break its flexibility—you limit it to working on just one type. Without such tests, your code may be able to work on a whole range of types. This is related to the idea of polymorphism mentioned earlier, and it stems from ...
If you want to see what your code does line by line, there's no need to put a breakpoint on every line, you can step through your code. Let's see what it looks like to step through our example program. Start or restart the debugger by using the Run widget at the top of the wi...
foriinrange(2,4):value=f"Sheet{i}!A1:A2"print(xl(value)) returns KeyError: 'Sheet2!A1:A2' Noting that it cannot find Sheet2!A1:A2 because it does not exist despite the fact it does. foriinrange(2,4):value=f"Sheet{i}!A1:A2"print(xl(value))print(xl("Sheet2!A1:A2"))...
print("What\'s your name ?") print('Do you know \"Python\" ?') 执行以上代码,输出结果为: What's your name ? Do you know "Python" ? 13.2 转义字符 由反斜杠加上一个字符或数字组成,它把反斜杠后面的字符或数字转换成特定的意义。简单来说就是字符要转成其他含义的的功能,所以我们叫它 “转...