Python List of Lists

A Python List of Lists is an array of array composed of Python lists.

• Example(s):
  • LoL = [[3, 'a', 4], ['b', 5, 11], [1, 7, 3.1]]
LoL2[2][1]
LoL2[1:]
  • LoL = [[1,2,3,4,5],[1,2,3,4,5],[1,2,3,4,5]]
[sublist[:3] for sublist in LoL]
OUTPUT: [[1, 2, 3], [1, 2, 3], [1, 2, 3]]
  • empty_LoL=[[] for i in range(4)] results in [[], [], [], []]
• Counter-Example(s):
  • a Python List of Dictionaries.
  • a Python List Tuple, such as:
    LoT = [(0,'a'), (1,'b'), (2,'c')]
• See: Python Matrix.

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References

2010

• http://stackoverflow.com/questions/11487049/python-list-of-lists
  • QUOTE: Lists are a mutable type - in order to create a copy (rather than just passing the same list around), you need to do so explicitly:
    listoflists.append((list[:], list[0]))
    However, list is already the name of a Python built-in - it'd be better not to use that name for your variable.

listoflists = []
a_list = []
for i in range(0,10):
   a_list.append(i)
   if len(a_list)>3:
       a_list.remove(a_list[0])
       listoflists.append((list(a_list), a_list[0]))
print listoflists

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