Re: class definition question
On 07Aug2019 16:36, Terry Reedy wrote: On 8/7/2019 3:26 PM, Manfred Lotz wrote: On Wed, 07 Aug 2019 14:39:00 -0400 Dennis Lee Bieber wrote: On Wed, 7 Aug 2019 20:11:15 +0200, Manfred Lotz declaimed the following: More often I see something like this: class Myclass: ... but sometimes I see class Myclass(object): ... Question: which way is preferable? It's historical... Python v1.x had a form of classes. Python v2.x introduced "new-style" classes. "New-style" classes /had/ to inherit from "object", as they had different behavior from "v1.x old-style" classes which were still supported (it would have broken too many programs). Old-style were then deprecated, and one should have used new-style for new code. Python v3.x unified (removed old-style behavior differences) and all classes inherit from "object" whether one specifies object or not. Thanks a lot for the explanations. As a Python newbie (with no Pythons legacies) I only deal with Python 3. So, I will happily ignore 'object'. That is preferred, because it is extra work to write and read, with no benefit, and because myclass(object) can be seen as implying that the code once ran or is still meant to be compatible with Python 2. By contrast, I generally use MyClass(object) because I try to write Python 2/3 compatible code unless I have a reason not to. If I _know_ I'll never use a module with Python 2, the bare MyClass: is indeed preferable. However, a lot of my code is in modules which might conceivably be used by anyone. Artificially contraining their use seems counterproductive. Cheers, Cameron Simpson -- https://mail.python.org/mailman/listinfo/python-list
Re: class definition question
On 8/7/2019 3:26 PM, Manfred Lotz wrote: On Wed, 07 Aug 2019 14:39:00 -0400 Dennis Lee Bieber wrote: On Wed, 7 Aug 2019 20:11:15 +0200, Manfred Lotz declaimed the following: Hi there, More often I see something like this: class Myclass: ... but sometimes I see class Myclass(object): ... Question: which way is preferable? It's historical... Python v1.x had a form of classes. Python v2.x introduced "new-style" classes. "New-style" classes /had/ to inherit from "object", as they had different behavior from "v1.x old-style" classes which were still supported (it would have broken too many programs). Old-style were then deprecated, and one should have used new-style for new code. Python v3.x unified (removed old-style behavior differences) and all classes inherit from "object" whether one specifies object or not. Thanks a lot for the explanations. As a Python newbie (with no Pythons legacies) I only deal with Python 3. So, I will happily ignore 'object'. That is preferred, because it is extra work to write and read, with no benefit, and because myclass(object) can be seen as implying that the code once ran or is still meant to be compatible with Python 2. -- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list
Re: class definition question
On Wed, 07 Aug 2019 14:39:00 -0400 Dennis Lee Bieber wrote: > On Wed, 7 Aug 2019 20:11:15 +0200, Manfred Lotz > declaimed the following: > > >Hi there, > >More often I see something like this: > > > >class Myclass: > >... > > > > > >but sometimes I see > > > >class Myclass(object): > >... > > > > > >Question: which way is preferable? > > It's historical... > > Python v1.x had a form of classes. > > Python v2.x introduced "new-style" classes. "New-style" > classes /had/ to inherit from "object", as they had different > behavior from "v1.x old-style" classes which were still supported (it > would have broken too many programs). Old-style were then deprecated, > and one should have used new-style for new code. > > Python v3.x unified (removed old-style behavior differences) > and all classes inherit from "object" whether one specifies object or > not. > > Thanks a lot for the explanations. As a Python newbie (with no Pythons legacies) I only deal with Python 3. So, I will happily ignore 'object'. -- Manfred -- https://mail.python.org/mailman/listinfo/python-list
class definition question
Hi there, More often I see something like this: class Myclass: ... but sometimes I see class Myclass(object): ... Question: which way is preferable? -- Manfred -- https://mail.python.org/mailman/listinfo/python-list
