2 min read•june 24, 2024
Nested lists in Python allow for complex data organization, enabling the creation of multi-dimensional structures like matrices and tables. They're essential for representing hierarchical information and can be manipulated using various methods and multi-dimensional .
Traversing nested lists often involves using , with outer loops iterating over the main list and inner loops handling inner lists. This approach is crucial for processing and modifying data within complex nested structures, making it a fundamental skill in Python programming.
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and separating elements with commas
nested_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[append()](https://www.fiveableKeyTerm:append())
method[extend()](https://www.fiveableKeyTerm:extend())
methodinsert()
methodremove()
method or del
statement[]
at different levels of nesting
nested_list[0][1]
accesses the second element of the first inner listnested_list[1][2] = 10
changes the third element of the second inner list to 10nested_list[0:2][1]
returns the second inner list from the first two inner listsfor inner_list in nested_list: for element in inner_list: print(element)
total = 0 for inner_list in nested_list: for element in inner_list: total += element
for i in range(len(nested_list)): for j in range(len(nested_list[i])): if nested_list[i][j] % 2 == 0: nested_list[i][j] *= 2