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 = [[]] * 4
x[1].append(7)
print(x)
Solution
The output of the given Python code will be [[7], [7], [7], [7]].
Here's the step by step explanation:
-
x=[[]]*4creates 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. -
x[1].append(7)appends the integer 7 to the second list inx. However, since all 4 lists are the same in memory, this actually appends 7 to all of the lists. -
print(x)prints the listx, which is now a list of 4 lists, each containing the integer 7.
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