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What will be the output of the following Python code?x=[[]]*4x[1].append(7)print(x)

Question

What will be the output of the following Python code?x=[[]]*4x[1].append(7)print(x)

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Solution

The output of the given Python code will be [[7], [7], [7], [7]].

Here's the step by step explanation:

  1. x=[[]]*4 creates a list of 4 empty lists. However, it's important to note that all 4 of these lists actually point to the same memory location. In other words, they are all the same list in memory.

  2. x[1].append(7) appends the integer 7 to the second list in x. However, since all 4 lists are the same in memory, this actually appends 7 to all of the lists.

  3. print(x) prints the list x, which is now a list of 4 lists, each containing the integer 7.

This problem has been solved

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