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pythonlistappendextend

Combine lists to get list of lists in python

aa = ['a']
bb = ['b']
aa.extend(bb)
['a', 'b']

In the example above, I would like to combine 2 lists to get list of lists, [['a'], ['b']], but extend does not allow that. How can I achieve it in python?

Solution

  • You get a list of lists, you could go about this way:

    >> aa = ['a']
>> bb = ['b']
>> cc = []
>> cc.append(aa)
>> cc
[['a']]
>> cc.append(bb)
>> cc
[['a'], ['b']]

    Or another way could be:

    >> dd = list((aa,bb))
>> dd
[['a'], ['b']]

    I suggest using the append keyword as it makes it easier to use it within a loop.