通过列表理解修改列表中的列表

简单的列表理解就足够了:

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

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

结果:

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

您可以在列表理解中设置项目,

您的代码:

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

转换为列表理解:

[[two.__setitem__(0,'--') if two[1]==one[1] and two[0]=='=' else two for two in raw] if one[0]=='-' else one for one in raw]
print(raw)

输出:

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