i woule a way to parse a line python source like split

[stranac]

You can use the tokenize module to get a list of tokens from python code:

>>> f = io.BytesIO(b"a[0]=int(ab[16])+2")
>>> tokens = list(tokenize.tokenize(f.readline))
>>> pp(tokens)
[
    tokenize.TokenInfo(
        type=57,
        string='utf-8',
        start=(0, 0),
        end=(0, 0),
        line=''
    ),
    tokenize.TokenInfo(
        type=1,
        string='a',
        start=(1, 0),
        end=(1, 1),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=53,
        string='[',
        start=(1, 1),
        end=(1, 2),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=2,
        string='0',
        start=(1, 2),
        end=(1, 3),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=53,
        string=']',
        start=(1, 3),
        end=(1, 4),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=53,
        string='=',
        start=(1, 4),
        end=(1, 5),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=1,
        string='int',
        start=(1, 5),
        end=(1, 8),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=53,
        string='(',
        start=(1, 8),
        end=(1, 9),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=1,
        string='ab',
        start=(1, 9),
        end=(1, 11),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=53,
        string='[',
        start=(1, 11),
        end=(1, 12),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=2,
        string='16',
        start=(1, 12),
        end=(1, 14),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=53,
        string=']',
        start=(1, 14),
        end=(1, 15),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=53,
        string=')',
        start=(1, 15),
        end=(1, 16),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=53,
        string='+',
        start=(1, 16),
        end=(1, 17),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=2,
        string='2',
        start=(1, 17),
        end=(1, 18),
        line='a[0]=int(ab[16])+2'
    ),
    tokenize.TokenInfo(
        type=0,
        string='',
        start=(2, 0),
        end=(2, 0),
        line=''
    )
]
>>> [t.string for t in tokens]
['utf-8', 'a', '[', '0', ']', '=', 'int', '(', 'ab', '[', '16', ']', ')', '+', '2', '']

However, if you're looking to modify the code, using ast with a custom NodeTransformer might be simpler. ast will get rid of comments though, so that might be a problem.