Code Explanataion:
🔹 1. Importing ChainMap
from collections import ChainMap
✅ Explanation
ChainMap is imported from Python's built-in collections module.
It combines multiple dictionaries into one logical view.
It does not merge or copy dictionaries.
When searching for a key, it checks the dictionaries from left to right.
Think of it as a dictionary search chain.
collections Module
│
▼
ChainMap
│
▼
Combine Multiple Dictionaries
Nothing executes yet.
🔹 2. Creating the First Dictionary
d1 = {"x": 10}
✅ Explanation
A dictionary named d1 is created.
Current Memory
d1
{
"x" : 10
}
Visual Representation
d1
│
└── x → 10
🔹 3. Creating the Second Dictionary
d2 = {"x": 50}
✅ Explanation
Another dictionary named d2 is created.
Current Memory
d2
{
"x" : 50
}
Visual Representation
d2
│
└── x → 50
🔹 4. Creating the ChainMap
c = ChainMap(d1, d2)
✅ Explanation
ChainMap creates one combined view of both dictionaries.
Important:
No new dictionary is created.
ChainMap stores references to d1 and d2.
It searches dictionaries in the same order they are passed.
Current Memory
ChainMap
↓
[d1, d2]
Visual Representation
ChainMap
│
┌───────┴────────┐
▼ ▼
d1 d2
{x:10} {x:50}
🔹 5. Searching for "x"
print(c["x"])
✅ Explanation
Python starts searching from the first dictionary.
Search Process
Search "x"
↓
d1
Found ✔
↓
10
Since "x" is found in d1, Python does not continue to d2.
So "50" is completely ignored.
🎯 Final Output
10
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