vim regex for python2 print to python3

Question

So say I have a python v2.7 file with some code like this:

print 'asdf'
print 'hi mom!'

But I want to run it in python3, I'll need to add those parenthesis to them like so:

print('asdf')
print('hi mom!')

I was trying to use the following regex in vim to solve the problem, but it wasn't working:

:%s/print\ '.*'/print('\1')/gc

It just gave me print functions (with parenthesis) that had empty strings. Any help is appreciated; thanks.

For the love of all that is optimized and provable, please use 2to3 — inspectorG4dget
– inspectorG4dget, Commented Jul 26, 2013 at 0:42

FDinoff · Accepted Answer · 2013-07-26 01:10:09Z

3

This would work for your examples

:%s/print \('.*'\)/print(\1)/g

You don't need to escape the space.
You don't actually capture anything in parenthesis so the \1 is an empty string in your regex.

But I also recommend using 2to3

edited Jul 26, 2013 at 1:10

answered Jul 26, 2013 at 0:59

FDinoff

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2 Comments

Benjamin Over a year ago

Thanks, that is the regex that I was looking for. I don't need something like '2to3', but thanks anyways.

FDinoff Over a year ago

@Benjamin if you are going to spend a lot of time using regexes in vim (if you use vim you will probably use them a lot) I would recommend reading or skimming a lot of :h pattern-searches

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