在Python重载功能？

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

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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