Support for underscores in Python numbers #3038

[marvintensuan]

Modified the regex for number in prism-python.js from:

prism/components/prism-python.js

Line 57 in 59f449d

'number': /(?:\b(?=\d)|\B(?=\.))(?:0[bo])?(?:(?:\d|0x[\da-f])[\da-f]*(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?j?\b/i,

to:

/(?:\b(?=\d)|\B(?=\.))(?:0[bo](_)?)?(?:(?:\d|0x(_)?[\da-f])([\da-f]|[\da-f]_)*(?:\.\d*)?|\.\d+|((\d+_)*(\.)?(\d+)?)*)(?:e[+-]?\d+)?([^_]j)?\b/i

I have highlighted the rationale at #3038. Additional test cases were also added.

---

Test results:

> prismjs@1.24.1 test:languages (...)\prism
> mocha tests/run.js "--language=python"



  Testing language 'python'
    √ – should pass test case 'boolean_feature'
    √ – should pass test case 'builtin_feature'
    √ – should pass test case 'class-name_feature'
    √ – should pass test case 'comment_feature'
    √ – should pass test case 'decorator_feature'
    √ – should pass test case 'function_feature'
    √ – should pass test case 'issue1355'
    √ – should pass test case 'keyword_feature'
    √ – should pass test case 'number_feature'
    √ – should pass test case 'operator_feature'
    √ – should pass test case 'string-interpolation_feature'
    √ – should pass test case 'string_feature'
    √ – should pass test case 'triple-quoted-string_feature'


  13 passing (101ms)

[github-actions]

JS File Size Changes (gzipped)

A total of 1 files have changed, with a combined diff of +13 B (+1.2%).

file	master	pull	size diff	% diff
components/prism-python.min.js	1.05 KB	1.06 KB	+13 B	+1.2%

Generated by 🚫 dangerJS against c56db5a

[RunDevelopment]

Thank you for the PR @marvintensuan!

I have a suggestion. Also, please rebuild Prism by running npm run build and committing the changes to prism-python.min.js.

[RunDevelopment]

Thank you for contributing @marvintensuan!