How do I move Python 2 to Python 3?
Table of Contents
- Drop support for Python 2.6 and older.
- Make sure you specify the proper version support in your setup.py file.
- Have good test coverage.
- Learn the differences between Python 2 & 3.
- Update your code.
- Prevent compatibility regressions.
- Check which dependencies block your transition.
Can a program written in Python 3 run in Python 2?
In a lot of cases it would better if we write Python programs that worked, without change, on both Python 2 and Python 3 (where “Python 3” really means version 3.3 or later). As a result, you can program in Python 2 but using certain Python 3 extensions… and the resulting code works on both.
What are the differences between Python 2 and Python 3 versions?
Python 3 is more in-demand and includes a typing system. Python 2 is outdated and uses an older syntax for the print function. While Python 2 is still in use for configuration management in DevOps, Python 3 is the current standard. Python (the code, not the snake) is a popular coding language to learn for beginners.
Why should I migrate to Python 3?
Tangible benefits. Python 3 comes with more tangible benefits, as well. For instance, Instagram—one of the most popular software products that use Python—reported a 12\% CPU performance boost and a 30\% improvement in using memory resources after their Python 3 migration combined with a Django update.
When did Python 3 release?
December 3rd, 2008
Python 3.0 final was released on December 3rd, 2008. Python 3.0 (a.k.a. “Python 3000” or “Py3k”) is a new version of the language that is incompatible with the 2.
Which is faster Python 2 or 3?
So is Python 3 faster than Python 2? Yes! in almost all tests. The notable exceptions were the crypto_paes test, where Python 3 was 1.35x slower (because of the integer types), python_startup as 1.39x slower.
Why is Python 2 still used?
Because some old projects are build on 2x version. So to maintain it you need to use 2x version, because rewriting whole application to new version is not good idea and it costs a lot. I still overwhelmingly use Python 2.7. x for a lot of things.
Which Python 3 version is best?
Version 2.7. 9 will be the best choice because the tutorial which are available on the internet are mostly of Python 2 language and very few of Python 3. Once you get to know about Python 2, it will not be difficult for you to switch to Python 3.
What Python version should I use?
For the sake of compatibility with third-party modules, it is always safest to choose a Python version that is one major point revision behind the current one. At the time of this writing, Python 3.8. 1 is the most current version. The safe bet, then, is to use the latest update of Python 3.7 (in this case, Python 3.7.
Was Python 3 a mistake?
The biggest mistake Python 3 made was the print statement change. There was really no compelling reason to do it, it broke basically 2. Sure it’s easy to fix, but it made a ton of scripts stop working despite being otherwise unaffected by the version change, all for the sake of a small syntax change.
What version of python do I need to run a project?
As your project does not support Python 3 yet you should at least have Programming Language :: Python :: 2 :: Only specified. Ideally you should also specify each major/minor version of Python that you do support, e.g. Programming Language :: Python :: 2.7.
When did Python change from __future__ to __import__?
This change has actually been planned since Python 2.2 which was released in 2002. Since then users have been encouraged to add from __future__ import division to any and all files which use the / and // operators or to be running the interpreter with the -Q flag.
How do I make my project single-source Python 2/3 compatible?
To make your project be single-source Python 2/3 compatible, the basic steps are: Only worry about supporting Python 2.7 Make sure you have good test coverage (coverage.py can help; pip install coverage) Learn the differences between Python 2 & 3 Use Futurize (or Modernize) to update your code (e.g. pip install future)
Should I use Python 2 or futurize to learn Python 3?
As Python 3 is the future, it might be best to consider Futurize to begin adjusting to any new practices that Python 3 introduces which you are not accustomed to yet. Regardless of which tool you choose, they will update your code to run under Python 3 while staying compatible with the version of Python 2 you started with.
https://www.youtube.com/watch?v=GKsCitAEKow