将数组/列表传递给 Python 函数 [英] Passing an array/list into a Python function

问题描述

我一直在研究将数组或列表(Python 倾向于调用它们)传递到函数中.

I've been looking at passing arrays, or lists, as Python tends to call them, into a function.

我阅读了一些关于使用 *args 的内容，例如:

I read something about using *args, such as:

def someFunc(*args)
    for x in args
        print x

但不确定这是对还是错.似乎没有什么能如我所愿.我曾经能够轻松地将数组传递给 PHP 函数，这让我很困惑.看来我也不能这样做:

But not sure if this is right/wrong. Nothing seems to work as I want. I'm used to be able to pass arrays into PHP function with ease and this is confusing me. It also seems I can't do this:

def someFunc(*args, someString)

因为它抛出了一个错误.

As it throws up an error.

我觉得自己完全糊涂了，正在找人帮我解决问题.

I think I've just got myself completely confused and looking for someone to clear it up for me.

推荐答案

当您使用以下语法定义函数时:

When you define your function using this syntax:

def someFunc(*args):
    for x in args
        print x

您告诉它您期望可变数量的参数.如果你想传入一个列表(来自其他语言的数组)，你可以这样做:

You're telling it that you expect a variable number of arguments. If you want to pass in a List (Array from other languages) you'd do something like this:

def someFunc(myList = [], *args):
    for x in myList:
        print x

然后你可以这样调用它:

Then you can call it with this:

items = [1,2,3,4,5]

someFunc(items)

您需要在变量参数之前定义命名参数，在关键字参数之前定义变量参数.你也可以这样:

You need to define named arguments before variable arguments, and variable arguments before keyword arguments. You can also have this:

def someFunc(arg1, arg2, arg3, *args, **kwargs):
    for x in args
        print x

至少需要三个参数，并且支持可变数量的其他参数和关键字参数.

Which requires at least three arguments, and supports variable numbers of other arguments and keyword arguments.

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