每条if语句的核心都是一个值为True或False的表达式,这种表达式被称为条件测试。 Python根据条件测试的值为True还是False来决定是否执行if语句中的代码块。 如果条件测试的值为True,Python就执行紧跟在if语句后面的代码块。 如果条件测试的值为False,Python就忽略紧跟在if语句后面的代码块,要么执行else语言后面的代码块,...
Using If…Else in a While Loop Best Practices for Using If Statements in Python Comparison of Conditional Statements in Python Real-World Examples of the If…Else Statement in Python Conclusion Python Conditional Statements In Python, conditional statements control the flow of a program by making de...
if (boolean expression) then clause end if An if then conditional can be extended using the else option to form an if then else statement. There is no conditional expression associated with the else component. The program makes all decisions when it evaluates the if expression. if (boolean ...
If user enters0, the conditionnumber > 0evalutes toFalse. Therefore, the body ofifis skipped and the body ofelseis executed. Python if…elif…else Statement Theif...elsestatement is used to execute a block of code among two alternatives. However, if we need to make a choice between mor...
exceptValueError:# Code to handle the exceptionprint("Invalid input! Please enter a number.")else:# Code to execute if no exception is raisedprint("You entered a valid number.")finally:# Code to execute regardless of whether an exception was raisedprint("Thank you for using this program."...
在Python 中,条件语句又叫作判断语句,由 if、 elif和 else 3 种语句组成,其中 if 为强制语句,可以独立使用,elif 和 else 为可选语句,并且不能独立使用。 判断语句配合布尔值,通过判断一条或多条语句的条件是否成立(True 或者 False),从而决定下一步的动作,如果判断条件成立(True),则执行 if 或 elif 语句下...
/* run this program using the console pauser or add your own getch, system("pause") or input loop */ int main(int argc, char *argv[]) { float x,y; printf("请输入x:"); scanf("%f",&x); if(x<1) y=x; else { if(x<10) ...
在Python中,条件语句又叫做判断语句,判断语句由if, elif以及else三种语句组成,其中if为强制语句,可以独立使用,elif和else为可选语句且不能独立使用。判断语句通过判断一条或多条语句的条件是否成立(True或者False),从而决定下一步的动作,如果判断条件成立(True),则执行if或elif语句下面的代码,如果判断条件不成立(Fals...
might stop working once you update its version. Perhaps parts ofnumpyare no longer compatible with other parts of your program. Creating virtual environments prevents this. They are also useful in cases when you are collaborating with someone else, and you want to make sure that your application...
在Python中没有switch语句。你可以使用if..elif..else语句来完成同样的工作(在某些场合,使用 字典会更加快捷。) 在C/C++中,如果你想要写for (int i = 0; i < 5; i++),那么用Python,你写成for i in range(0,5)。你 会注意到,Python的for循环更加简单、明白、不易出错。