[Tutor] Baffling problem with a list of objects sharing a property

[Danny Yoo]

> They are. You've stiumbled on one of those Python peculiarities of
> implementation that can be useful and annoying in equal measure.
>
>> class Test(object):
>>  def __init__(self, name, paths=[]):
>>   self.name = name
>>   self.paths = paths
>
> When you give a function/method a default value that same object is used
> for *every* invocation of the method where the default applies.


By the way, this is one of the things that tools like pylint
(https://www.pylint.org/) will warn about.

    http://pylint-messages.wikidot.com/messages:w0102

Just to note that there are external "lint" tools that can help catch
this class of problems automatically.



Best of wishes!