在Python重载功能？ [英] Overloaded functions in python?

问题描述

时有可能有重载函数在Python？在C＃中我会做这样的事情。

Is it possible to have overloaded functions in Python? 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
}
// This maybe a little off, I haven't coded C# in a couple years

，然后当我调用该函数将在两者之间基于参数的数量区分。是否有可能做在Python类似的东西？

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

修改：用于在Python 3.4新单牒的通用功能，看到的 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/

您一般不需要重载在Python功能。 Python是动态类型和支持可选参数的函数。

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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