With Python 3 getting the continuing future of Python while Python 2 remains in productive usage, you should have your project designed for both big releases of Python. This informative guide is meant to let you work out how best to supporting both Python 2 3 simultaneously.
If you’re looking to port an extension component in place of pure Python rule, please discover Porting expansion Modules to Python 3 .
If you’d like to learn one core Python creator’s deal with the reason why Python 3 came into existence, you can read Nick Coghlan’s Python 3 Q A or Brett Cannon’s precisely why Python 3 is available.
The Short ExplanationA¶
Use Pylint to make certain you don’t regress on the Python 3 service ( python -m pip install pylint )
Usage caniusepython3 discover which of your dependencies tend to be preventing your own use of Python 3 ( python -m pip install caniusepython3 )
Once your dependencies are no longer blocking your, use constant integration to make sure you stay suitable for Python 2 3 (tox can experiment against numerous models of Python; python -m pip install tox )
Consider using optional static sort examining to be sure their type practices operates both in Python 2 3 (example. incorporate mypy to check on your keying in under both Python 2 Python 3; python -m pip install mypy ).
Notice: Using python -m pip install assures the pip your invoke could be the one installed for the Python presently in use, whether a system-wide pip or one put in within a virtual ecosystem .
DetailsA¶
An important facet about encouraging Python 2 3 simultaneously is you can start these days! Although the dependencies commonly support Python 3 yet that does not suggest it’s not possible to modernize the rule today to support Python 3. the majority of adjustment required to help Python 3 lead to cleaner code utilizing new methods even in Python 2 rule.
Another key point is the fact that modernizing your own Python 2 signal to furthermore support Python 3 is basically automated available. You might have to make some API decisions by way of Python 3 making clear book data versus binary data, the lower-level work is today typically accomplished for you and hence can at least benefit from the robotic adjustment immediately.
Hold those tips planned although you keep reading in regards to the information on porting your rule to compliment Python 2 3 concurrently.
Drop help for Python 2.6 and olderA¶
As you could make Python 2.5 utilize Python 3, it really is a lot easier if you just utilize Python 2.7. If dropping Python 2.5 isn’t an option then your six project assists you to supporting Python 2.5 3 concurrently ( python -m pip install six ). Perform recognize, though, that the majority of the projects placed in this HOWTO will not be available to you.
In case you are able to skip Python 2.5 and old, then the necessary variations to your signal should continue to look and feel like idiomatic Python laws. At the worst you’re going to have to Milf dating need a work instead of a technique sometimes or must transfer a function instead of making use of an integrated one, but otherwise the entire change ought not to believe foreign to you.
However should strive for just supporting Python 2.7. Python 2.6 is no longer easily backed and so just isn’t obtaining bugfixes. This simply means you will have to run around any dilemmas you find with Python 2.6. There are additionally some apparatus talked about within HOWTO that do not supporting Python 2.6 (elizabeth.g., Pylint), which will be a little more commonplace as time goes on. It is going to simply feel easier for you if you best support the models of Python that you must supporting.