Convert python 2 code to 3 in PyCharm

Question

I have a large ML project in python 2 code and I just started using PyCharm as an IDE. I'm currently using WinPython 3.4 and I'd preferably like to do everything in python 3 instead of continue using legacy 2. When I cloned the project from git a popup in pycharm came up that was something along the lines of converting the code to 3 from 2 but I didn`t really think about it and exited it. How do I convert it?

Answer 1

Goto the folder where your python2script.py is existing in command line,

then execute the command:

python C:/python/Tools/scripts/2to3.py -w python2script.py

you can see that your python2scipt.py is updated.

Answer 2

There's a script included with Python, usually at [Python Root]/Tools/Scripts/2to3.py. You can run that script on a python file (or directory of python files) and it will handle a lot of the conversions, at least for changes in the standard library.

It gets a little more complicated if your project uses other 3rd party libraries. It's possible the API's for those changed during the 2-to-3 transition, and the 2to3.py script will not know about those api changes. Your best bet is to run the conversion script, and then manually make any other changes that are needed.

Answer 3

Before anything I would save a backup copy of your Python 2 file first.

You can then try to convert the code using the "2to3" Automated Python 2 to 3 code translation tool which is built into Python via the Standard Library. Details on usage can be found here: https://docs.python.org/2/library/2to3.html#

You also have the choice between two tools to port your code automatically: Modernize and Futurize. Check them out below.

Modernize --> https://python-modernize.readthedocs.io/en/latest/

Futurize --> http://python-future.org/automatic_conversion.html

In terms of Pycharm, I have not seen / don't know of any specialized tool within the IDE that converts code from Python 2 to Python 3. I'd stick to the 3 tools above.

Good luck!

Answer 4

I found a way in Pycharm IDE to convert file from v2 to v3 using 2to3 tool.

I applied in pycharm comunity edition v 2016.2.3 in windows environment.

• click terminal in status bar Now, you are in shell command, in the root of your project.

• type the command (to convert myfile.py):

  2to3 myfile.py -w

The tool modifies the code of the file, and your IDE is reflected with the changes.

To modify all your files in the folder, type the command

2to3 . -w

The option -w to actually write the changes. For more details write:

  2to3 -h

Answer 5

In order to convert your python script from version-2 to version-3, you can simply use 2to3 utility.

On linux terminal -

$ 2to3 my_file.py              # shows output only on terminal

or

$ 2to3 -w my_file.py           # overwrites the file with python-3 code

where my_file.py is the file which you want to convert.