How to fix TypeError: unhashable type: 'list' when using a mutable data type... in Python

Hello, Dedicated Coders! 🖥️💡

We're excited to share with you our newest video, "How to solve TypeError: unhashable type: 'list' when using a mutable data type as a key in a dictionary. in Python". 🎥 This series is meticulously designed to arm you with knowledge 🧠 and skills 🛠️ to overcome frequent coding challenges.

Today, we will decipher 🔎 and resolve a common error faced by Python coders: the bit hard to solve TypeError: unhashable type: 'list' when using a mutable data type as a key in a dictionary.. Here is a snapshot of the code of the video:

Troubling Scenario: ❗️

d = {}
d[[1, 2, 3]] = "some value"

Unwanted Result: 🚫
TypeError: unhashable type: 'list' when using a mutable data type as a key in a dictionary.

Effective Resolution: ✔️

d = {}
d[(1, 2, 3)] = "some value"

Desired Output: 🏁
No output.

In this detailed walkthrough, we will illuminate 💡 the underlying cause of this error, and offer a comprehensive explanation: Code1 uses a list, which is mutable and unhashable, as a dictionary key causing a TypeError. Code2 correctly uses a tuple, which is immutable and hashable, avoiding the error. 🎯

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