How can we iterate over a list of lists using a "for" loop in Python?
To iterate over a list of lists using a "for" loop in Python, we can make use of nested loops. By nesting a "for" loop inside another "for" loop, we can traverse through each element in the outer list and then iterate over the inner lists.
Here's an example to illustrate the process:
python
list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
for sublist in list_of_lists:
for element in sublist:
print(element)
In this example, we have a list called `list_of_lists` which contains three inner lists. The outer loop iterates over each sublist, and the inner loop iterates over each element within the sublist. The `print(element)` statement will output each element individually.
The output of the above code will be:
1 2 3 4 5 6 7 8 9
By using this nested loop structure, we can access and manipulate each individual element within the list of lists. For example, we could perform calculations on the elements or apply specific operations based on certain conditions.
It's important to note that the number of nested loops should match the depth of the list of lists. In our example, since we have a list of lists with a depth of two, we have two nested loops. If we had a list of lists with a depth of three, we would need three nested loops, and so on.
To iterate over a list of lists using a "for" loop in Python, we can use nested loops. The outer loop iterates over the outer list, and the inner loop iterates over each inner list, allowing us to access and manipulate individual elements within the list of lists.
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