>>> data = [
...     [1, 'test1', '/path/to'],
...     [2, 'test2', '/path/to/'],
...     [3, 'test3', '/path/to/'],
...     [4, 'test4', '/path/to/']
... ]
>>> del data[2]
>>> data
[[1, 'test1', '/path/to'], [2, 'test2', '/path/to/'], [4, 'test4', '/path/to/']]
>>> for i, item in enumerate(data):
...     item[0] = i + 1
... 
>>> data
[[1, 'test1', '/path/to'], [2, 'test2', '/path/to/'], [3, 'test4', '/path/to/']]
>>>