How to fix KeyError when accessing inv_map using original dictionary values ... in Python

Hello, Dedicated Coders! 🖥️💡

We're excited to share with you our newest video, "How to solve KeyError when accessing inv_map using original dictionary values that are not unique keys in the new inverted 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 KeyError when accessing inv_map using original dictionary values that are not unique keys in the new inverted dictionary.. Here is a snapshot of the code of the video:

Troubling Scenario: ❗️

original = {'a': 1, 'b': 1, 'c': 2}
print(inv_map[1])

Unwanted Result: 🚫
KeyError when accessing inv_map using original dictionary values that are not unique keys in the new inverted dictionary.

Effective Resolution: ✔️

original = {'a': 1, 'b': 1, 'c': 2}
# This will store all keys with the same value in a list
inv_map = {}
print(inv_map[1])

Desired Output: 🏁
['a', 'b']

In this detailed walkthrough, we will illuminate 💡 the underlying cause of this error, and offer a comprehensive explanation: Code1 has a KeyError because multiple keys in `original` map to the same value, overwriting previous key-value pairs in `inv_map`. Code2 corrects this by listing all keys for each value. 🎯

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