![#Python Class Inheritance Syntax Reel by @learninstudy - This output surprises most Python students π΅βπ«
When you write a = [[0]] * 3, Python does not create three independent lists.
Instead, it creates th](https://image.pictame.com/img/630730236_17855819826614447_8504412477503914307_n.jpg?hash=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)
143
LEThis output surprises most Python students π΅βπ«
When you write a = [[0]] * 3, Python does not create three independent lists.
Instead, it creates three references pointing to the same inner list in memory.
Think of it like this π
You didnβt make three notebooks β you made one notebook with three bookmarks
So when you run a[0][0] = 99, youβre modifying that single shared list.
Because all three elements in a point to the same object, the change appears everywhere:
[[99], [99], [99]] β
This is why list multiplication with nested lists is dangerous.
It leads to silent bugs in projects, wrong data in ML models, and tricky interview questions.
Correct approach: always use list comprehension when creating nested lists.
Understanding memory references is what separates beginners from real Python developers.
Save this β this detail matters more than syntax
#Python #PythonTricks #PythonEdgeCases #CodingTips #ProgrammingLife
@learninstudy
![#Python Class Inheritance Syntax Reel by @learninstudy - This one tests whether you understand equality vs identity in Python π
== checks value equality.
Two empty lists have the same value, so:
[] == []](https://image.pictame.com/img/631274563_1245417380854356_4420608048047673861_n.jpg?hash=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)
