Modifying lists within lists via list comprehension

Question

how can I get these loops and if statements into a comprehension?

raw = [['-', 'bla'], ['-', 'la'], ['=', 'bla']]

for one in raw:
    if one[0] == '-':
        for two in raw:
            if two[1] == one[1] and two[0] == '=': two[0] = '--'

So far:

[two+one for two in raw for one in raw]

But not sure where to put the if statements:

if one[0] == '-' and if two[1] == one[1] and two[0] == '=': two[0] = '--'

Answer 1

A simple list comprehension should be sufficient:

raw = [['-', 'bla'], ['-', 'la'], ['=', 'bla']]

res = [['--' if (i != '-') and (['-', j] in raw) else i, j] for i, j in raw]

Result:

[['-', 'bla'], ['-', 'la'], ['--', 'bla']]