In some cases, when you’re defining a function, you may not know beforehand how many arguments you’ll want it to take. Suppose, for example, that you want to write a Python function that computes the average of several values. You could start with something like this:...
Here's the syntax for defining a function in Python:def function_name(parameter1, parameter2, ...): # Function body (code block) # Indented code executed when the function is called # Optionally, return a value using the return statement Python function example: Multiply two numbers and ...
函数的第一条语句("function_docstring")是可选语句; 每个函数中的代码块均以冒号(:)开头并缩进。 例,绝对值函数的定义: defabs(x):## define a function named 'abs' of one argument named 'x'ifx>=0:## function body starts herereturnxelse:return-x## function body ends here 3. Calling a F...
We can add as many lines as we'd like to the body of the function but each line must be indented the same number of spaces to the right. Defining Functions Recap:概述 我们看了一些Python内置函数的示例,但是能够定义自己的函数非常强大。 我们以 def 关键字开始函数定义,后跟我们要赋予函数的名称...
4.6. Defining Functions We can create a function that writes the Fibonacci series to an arbitrary boundary: 我们创建一个斐波那契数列的函数: >>>def fib(n): # write Fibonacci series up to n ..."""Print a Fibonacci series up to n."""... a, b=0,1...whilea <n: ...
Now you’re ready to go write some awesome Pythonmain()function code! Take the Quiz:Test your knowledge with our interactive “Defining Main Functions in Python” quiz. You’ll receive a score upon completion to help you track your learning progress: ...
Creating a Function In Python a function is defined using thedefkeyword: ExampleGet your own Python Server defmy_function(): print("Hello from a function") Calling a Function To call a function, use the function name followed by parenthesis: ...
= 120, the advantage of lambda function avoid defining a function ### list expression numList = [1, 2, 6, 7] filter(lambda x : x % 2 == 0, numList) print [x for x in numList if x % 2 == 0] # the same as above map(lambda x : x * 2 + 10, numList) print ...
How to Define a Function: User-Defined Functions (UDFs) The four steps to defining a function in Python are the following: Use the keyword def to declare the function and follow this up with the function name. Add parameters to the function: they should be within the parentheses of the fu...
如此,函数就是类types.FunctionType或者其子类的实例对象。那么对象必然有其初始化的时候,一般来说,解释器在读到函数末尾时完成函数实例的初始化。初始化后,就有了函数名到函数对象这样一个映射关系,可以通过函数名访问到函数对象了,并且,函数的一切属性也确定下来,包括所需的参数,默认参数的值。因此每次调用函数时,...