对于不同功能的变量使用相同的名称？

Question

I've been searching a while for my question but haven't found anything of use. My question is rather easy and straightforward.

Is it preferable or perhaps "pythonic" to use the same name for a certain variable which will appear in different functions, but with the same purpose?

For example:

def first_function():
    pt = win.getMouse() # This waits for a mouseclick in a graphical window.

    if blabla.button.clicked(pt):
        second_function()

def second_function():
    pt = win.getMouse() 

    if whatever.button.clicked(pt):
        third_function()

Does it matter if the variable reference (pt) to win.getMouse() in the second_function() has the same name as the variable in the first_function() ? Or should the variable pt in the second function be named something else?

Answer 1

Names in functions are local ; reuse them as you see fit!

In other words, the names in one function have no relationship to names in another function. Use good, readable variable names and don't worry about names clashing.

Answer 2

Its not about "Pythonic" or not. In programming you always wish your variables to have a meaning, if the same name occures in differend functions that means they do things with the same purpose or same params. Its fine to use same names in different functions, as long as they don't collide and make problems

Answer 3

Variables defined in a function have Function Scope and are only visible in the body of the function.

See: http://en.wikipedia.org/wiki/Scope_(computer_science)#Python for an explanation of Python's scoping rules.