Porting Python 2 Laws to Python 3A¶

With Python 3 are the ongoing future of Python while Python 2 remains in productive usage, it is good to get job designed for both significant secretes of Python. This article is supposed to make it easier to work out how better to supporting both Python 2 3 at the same time.

If you are searching to port an extension component in place of pure Python laws, kindly see Porting expansion Modules to Python 3 .

If you’d like to learn one core Python designer’s accept the reason why Python 3 had become, you can read Nick Coghlan’s Python 3 Q A or Brett Cannon’s precisely why Python 3 exists.

The small ExplanationA¶

Incorporate Pylint to make positive that you don’t regress on your Python 3 support ( python -m pip install pylint )

Utilize caniusepython3 to learn which of one’s dependencies were blocking your use of Python 3 ( python -m pip install caniusepython3 )

When your dependencies are not any longer blocking you, use continuous integration to make sure you stay compatible with Python 2 3 (tox will help check against numerous models of Python; python -m pip install tox )

Contemplate using elective fixed means examining to be certain your own kind practices operates in Python 2 3 (example. incorporate mypy to check on their typing under both Python 2 Python 3; python -m pip install mypy ).

Mention: making use of python -m pip install assurances that pip you invoke may be the one put in for the Python at this time used, whether it is a system-wide pip or one put in within an online surroundings .

DetailsA¶

An important factor about supporting Python 2 3 simultaneously is that you can begin these days! Whether or not your own dependencies are not support Python 3 yet that will not imply you cannot modernize your laws now to compliment Python 3. Many changes required to support Python 3 induce cleaner laws utilizing new techniques in Python 2 Travel dating apps laws.

Another heavily weighed is modernizing the Python 2 laws to additionally support Python 3 is basically computerized available. Even if you need to make some API choices using Python 3 making clear text information versus digital information, the lower-level tasks are now largely accomplished for you and thus can at the least enjoy the automated variations instantly.

Hold those key points in mind as you continue reading regarding the information on porting their rule to guide Python 2 3 simultaneously.

Shed help for Python 2.6 and olderA¶

Although you makes Python 2.5 deal with Python 3, truly much simpler should you decide just use Python 2.7. If losing Python 2.5 is not an alternative then six venture will allow you to support Python 2.5 3 concurrently ( python -m pip install six ). Manage see, though, that nearly all the works placed in this HOWTO will not be accessible to you.

If you are able to skip Python 2.5 and more mature, then your required modifications to your laws should continue steadily to overall look and feeling like idiomatic Python rule. At worst you will need to incorporate a purpose in the place of a method in some instances or have to import a function in place of making use of a built-in one, but or else the overall transformation shouldn’t feeling international for you.

You should shoot for only promoting Python 2.7. Python 2.6 has stopped being easily recognized thereby just isn’t obtaining bugfixes. This implies you are going to need to run around any problems you find with Python 2.6. You will also discover some tools mentioned inside HOWTO which do not help Python 2.6 (age.g., Pylint), and this will are more common in the future. It will probably simply end up being simpler for you in the event that you only support the variations of Python you have to support.