Python 2 versus 3

[BIJAL MANIAR]

Hi,

I have current django application with django 1.11 and python 2.7.

Python 2.7 has support till 2020-01-01 and 3.5 has support till 2020-09-13.

I've been asked to upgrade to Python 3.5. My question is why is there a need to upgrade from 2.7 to 3.5 as EOL support for both of them is nearly the same. 

Should I invest time in upgrading to Python3.5 or not?

Which is the latest Python3 LTS version and its EOL support?

Any help would be appreciated.

Thanks,

Bijal

[Antonis Christofides]

Hi,

the reason is that Python 3.6 is backwards-compatible with 3.5. Same thing with 3.7 and 3.8 and generally 3.x for x>=6. In contrast, Python 3.0 is backwards-incompatible with 2.7. So if you upgrade to 3.5 now, your program will also run in any Python 3 version later than 3.5. The big thing is to upgrade from Python 2 to Python 3, the minor version numbers don't play any significant role. So yes, you should definitely invest in upgrading to Python 3.

As far as I know Python doesn't distinguish between LTS and non-LTS versions. The latest version is 3.6. There's a convenient version table at https://en.wikipedia.org/wiki/CPython#Version_history.

Regards,

Antonis

Antonis Christofides
http://djangodeployment.com

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[Lachlan Musicman]

Bijal,

Django 2.x - the next release cycle - will be Python 3.x

Most major OSes will be moving to Python 3.x in their next release (eg in RedHat/CentOS 7.4 (I think))...

If it's no big deal - and it really shouldn't be - you should move to Python 3.x

Cheers

L.

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[Melvyn Sopacua]

At this point it makes more sense to upgrade to 3.6, but that
aside, next Django release (2.0) will drop support for Python
2.

Dealing with 2 major version upgrades is not the best platform
for a smooth ride.

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[James Bennett]

Here is a very comprehensive article on why Python 3 is an improvement over Python 2:

https://eev.ee/blog/2016/07/31/python-faq-why-should-i-use-python-3/

[Ari Davidow]

Python 2 in general is reaching end of life. If you have the time to make the transition to Python 3 now, it will be significantly easier to maintain your installation (or any other python application) moving forward. 

ari

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