replace substring None with 'None'

Question

I want to change any None to 'None' (note single quotes) in a JSON file that contains both already.

type: None or
type: 'None'

I tried "s/[']?None[']?/'None'/g" but it doesn't seem to work.

He Shiming · Accepted Answer · 2012-04-03 23:06:41Z

3

Since you are changing all None to 'None', wouldn't it be easier to just use str.replace with that json string? I'd run it in two procedures, first change 'None' to None, then change all None to 'None'.

answered Apr 3, 2012 at 23:06

He Shiming

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1 Comment

daydreamer Over a year ago

thats what I am doing right now, but I am sure regex can do everything in one shot

Honest Abe · Accepted Answer · 2012-08-17 04:23:29Z

2

You could use a negative lookahead assertion (?!...):

import re

test = "type: None or 'None'"

result = re.sub(r"None(?!')", r"'None'", test)

This will match None as long as it is not directly followed by a '.

→ Regular Expression Syntax ←

edited Aug 17, 2012 at 4:23

answered Apr 3, 2012 at 23:04

Honest Abe

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3 Comments

He Shiming Over a year ago

You are also changing 'None' to ''None''

Gary Fixler Over a year ago

Your second example replaces whatever is immediately before or after None with ' characters. Something like "(1,None,2)" would become "(1'None'2)". This may not be a problem in the original JSON file, as there may always be spaces around instances of None, but I thought it was worth mentioning.

Honest Abe Over a year ago

@Gary Fixler Thanks. I agree it's worth mentioning.

sloth · Accepted Answer · 2012-07-30 06:37:43Z

0

s/([^'])?(None)([^'])?/$1'$2'$3/g

edited Jul 30, 2012 at 6:37

sloth

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answered Apr 3, 2012 at 23:19

fbdcw

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