1.return 语句先执行右侧的表达式,再将表达式的执行结果送回给当前函数的调用者 2.return 语句右侧的表达式可以省略,省略后相当于 return None 3.如果函数内没有return语句,则函数执行完最后一条语句后返回None) (相当于在最后加了一条return None语句) #示例见:#此示例示意return语句在函数中的应用defsay_hello2(
The Python return statement is a special statement that you can use inside a function or method to send the function’s result back to the caller. A return statement consists of the return keyword followed by an optional return value. The return value of a Python function can be any Python...
return x return x, inside # 将变量值和函数返回 o, i = outside() # 通过两个变量接收outside函数的返回值x和inside print(x) # 显示输出结果为:0 print(o) # 显示输出结果为:1 print(i()) # 显示输出结果为:2 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 刚才的...
return 1 else: return n * fn(n-1) print(fn(5)) 1. 2. 3. 4. 5. 6. 递归函数的优点是逻辑简单清晰,缺点是过深的调用会导致栈溢出。 解决递归调用栈溢出的方法是通过尾递归优化。 def fn(n): return fn_iter(n, 1) def fn_iter(num, product): if num == 1: return product return fn...
‘return‘ outside function 解决方法(Python) 例如:你要定义如下函数: def func(num): for num in range(1,10): if num==5: print("I find '5'") return func(5) 错误一:如果你忘记写def func(num):如下: for num in range(1,10):
However, you can use the "None" keyword instead, which implies absence of value, null or "nothing". It can be returned from a function in any of the following ways: By returning None explicitly; By returning an empty return; By returning nothing at all. Using any of these is ...
Finally, if you don’t want to use the ROUND() function, you can use a few alternatives. The CEIL() and FLOOR() functions both take a single number as an input and return the nearest integer. The TRUNC() function takes a single number as an input and returns the integer part of th...
Assigning functions to variables To kick us off we create a function that will add one to a number whenever it is called. We'll then assign the function to a variable and use this variable to call the function. def plus_one(number): return number + 1 add_one = plus_one add_one(5...
> CREATE TEMPORARY FUNCTION hello() RETURNS STRING RETURN 'Hello World!'; > SELECT hello(); Hello World! -- Create a permanent function with parameters. > CREATE FUNCTION area(x DOUBLE, y DOUBLE) RETURNS DOUBLE RETURN x * y; -- Use a SQL function in the SELECT clause of a query. >...
= raw_input()以及之后每一行都缩进了应该就好了你那一行一出来，return就在enter这个方法外了return ...