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dilip
answered May 14 '23 00:00
the [0]*x syntax creates a list of length x where each element is 0 In Python.
For example, consider the following code:
x = 5
my_list = [0]*x
print(my_list)
The output of this code would be:
[0, 0, 0, 0, 0]
This syntax is commonly used to initialize a list of a specific length with a default value. You can replace 0 with any other value to initialize the list with a different default value.
This syntax can be particularly useful when working with nested lists or arrays, where you may want to initialize all elements with a default value before assigning values to individual elements. For example:
rows = 3
cols = 4
my_matrix = [[0]*cols for _ in range(rows)]
print(my_matrix)
This code initializes a 3x4 matrix with all elements set to 0. The output would be:
[[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
Keep in mind that when using this syntax with mutable objects like lists, you will actually be creating multiple references to the same object. That means that changing one element of the list will change all other elements that reference the same object.