Python中的重载函数 [英] Overloaded functions in Python

问题描述

是否可以在Python中具有重载的功能?

Is it possible to have overloaded functions in Python?

在C#中，我会做类似的事情

In C# I would do something like

void myfunction (int first, string second)
{
    # Some code
}

void myfunction (int first, string second, float third)
{
    # Some different code
}

然后，当我调用该函数时，它将根据参数的数量在两者之间进行区分.可以在Python中做类似的事情吗?

And then when I call the function it would differentiate between the two based on the number of arguments. Is it possible to do something similar in Python?

推荐答案

EDIT 有关Python 3.4中新的单调度通用函数，请参见 http://www.python.org/dev/peps/pep-0443/

EDIT For the new single dispatch generic functions in Python 3.4, see http://www.python.org/dev/peps/pep-0443/

通常不需要在Python中重载函数.Python是动态键入的，支持函数的可选参数.

You generally don't need to overload functions in Python. Python is dynamically typed, and supports optional arguments to functions.

def myfunction(first, second, third = None):
    if third is None:
        #just use first and second
    else:
        #use all three

myfunction(1, 2) # third will be None, so enter the 'if' clause
myfunction(3, 4, 5) # third isn't None, it's 5, so enter the 'else' clause

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