However, if we need to make a choice between more than two alternatives, we use theif...elif...elsestatement. Syntax ifcondition1:# code block 1elifcondition2:# code block 2else:# code block 3 Let's look at an example. Working of if…elif…else Statement Example: Python if…elif…e...
The Python if..else statement executes a block of code, if a specified condition holds true. If the condition is false, another route can be taken.
实例(Python 3.0+) # Filename :test.py# author by : www.runoob.com# 内嵌 if 语句num=float(input("输入一个数字:"))ifnum>=0:ifnum==0:print("零")else:print("正数")else:print("负数") 执行以上代码输出结果为: 输入一个数字:0零 '输入的数字是零')elif0:print'输入的数字是正数')else:...
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deffetch_url(url):response=requests.get(url)print(f'获取 {url} 的响应: {response.status_code}')urls=['https://www.example.com','https://www.python.org','https://www.github.com']threads=[]forurlinurls:thread=threading.Thread(target=fetch_url,args=(url,))threads.append(thread)thread...
);if(mp3_bytes <0) { printf("lame_encode_buffer_interleaved returned %d\n", mp3_bytes); status= -1;gotofree_buffers; }elseif(mp3_bytes >0) { fwrite(mp3_buffer,1, mp3_bytes, outfp); } } }while(input_samples ==INBUFSIZE);/*Flush the encoder of any remaining bytes.*/mp3_bytes...
2. indentation(if else ) 3. use the falsy & truthy concepts For example an empty list/sequences [], empty dictionaries {} None, False, Zero for numeric types, are considered “falsy”. On the other hand, almost everything else is considered “truthy”. ...
ifcondition:# Code to execute if condition is Trueelse:# Code to execute if condition is False Copy Example: age=int(input("Enter your age: "))ifage>=18:print("You are eligible to vote.")else:print("You are not eligible to vote.") ...
除了使用if-else结构外,我们还可以使用多个if语句来执行多个代码块。在这种情况下,每个if语句都会独立判断条件,并执行与其关联的代码块。 number=15ifnumber>10:print("Number is greater than 10")print("This is the second line of code in the first if block")ifnumber%2==0:print("Number is even")...
x = first_choice if first_choice else second_choice 这实际上是Python内置的三元运算符糖衣语法 ,但使用and与or直接实现同样效果也颇具魅力: x = first_choice or second_choice 此表达式利用了or的短路特性,如果first_choice是“真”值 ,则直接返回它,否则继续评估并返回second_choice。