You can return None explicitly in a function like so: def foo(x): if x == 0: return None return 'foo' print(foo(0)) # None print(foo(1)) # 'foo' Returning an Empty return Returning an empty return in a function is the same as returning None explicitly: def foo(x): if...
1、判断该函数是否有返回值:按住ctrl+函数名,如果是none则没有返回值 函数中没有return就没有返回值,调用函数得到的结果就是None 2、函数返回多个值,在return后加,用,隔开 3、当函数执行到return后,会直接跳出函数返回结果(即:return后面的代码无意义) def func(a, b): c = a + b d = a - b return...
def test_return(): return 1,2 x,y =test_return() print(x) #返回结果1 print(y) #返回结果2 1. 2. 3. 4. 5. 6. 用“ ,”将两个返回值分割开,然后用两个变量分别接收就可以了,还可以用一个变量接收,系统会返回一个包含所有返回值的元组。 def test_return(): r1 = '第一个返回值' r2...
""" @functools.wraps(func) def wrapper(*args, **kwargs): start_time = time.time result = func(*args, **kwargs) end_time = time.time print(f"{func.__name__} 执行耗时 {end_time - start_time:.4f} 秒") return result return wrapper 示例:统计函数运行时间 @timeitdef slow_function:...
The index method can’t return a number because the substring isn’t there, so we get a value error instead: In order to avoid thisTraceback Error, we can use the keywordinto check if a substring is contained in a string. In the case of Loops, it was used for iteration, whereas in...
def choose(bool, a, b): return (bool and [a] or [b])[0] 因为 [a] 是一个非空列表,它永远不会为假。甚至 a 是 0 或 '' 或其它假值,列表[a]为真,因为它有一个元素。 7.how do I iterate over a sequence in reverse order
return 1 else: return n * factorial(n - 1) # 递归条件:n! = n * (n-1)! print(factorial(5)) # 输出:120 示例2:斐波那契数列(递归实现) python def fibonacci(n): if n <= 1: # 基线条件:fib(0)=0, fib(1)=1 return n
A.Python函数的返回值使用很灵活 , 可以没有返回值 , 可以有一个或多个返回值B.函数定义中最多含有一个return语句C.在函数定义中使用return语句时 , 至少给一个返回值D.函数只能通过print语句和return语句给出运行结果相关知识点: 试题来源: 解析 A 在Python语言中,return语句用来结束函数并将程序返回到函数被调...
Return Values To let a function return a value, use thereturnstatement: Example defmy_function(x): return5* x print(my_function(3)) print(my_function(5)) print(my_function(9)) Try it Yourself » The pass Statement functiondefinitions cannot be empty, but if you for some reason have...
Tuples are commonly used toreturn multiple values from a function. In order to return a key-value pair from a function, you can create a tuple with two elements, where the first element is the key and the second element is the value: ...