Explanation:
🔹 Line 1: Call zip()
zip([1,2], [3], strict=True)
We are passing:
[1,2]
and
[3]
to zip().
Length of first list:
2
Length of second list:
1
🔹 Step 2: Understand Normal zip()
Without strict=True:
list(zip([1,2], [3]))
Output:
[(1, 3)]
Why?
Because normal zip() stops when the shortest iterable ends.
Visual:
[1,2]
[3]
Pair created:
(1,3)
Now second list is exhausted.
So zip() stops.
🔹 Step 3: What Does strict=True Do?
zip(..., strict=True)
was introduced in Python 3.10.
It means:
All iterables must have exactly the same length.
If lengths differ:
Raise ValueError
instead of silently stopping.
🔹 Step 4: First Pair Creation
Python creates:
(1,3)
No problem yet.
Current result:
[(1,3)]
🔹 Step 5: Check for More Elements
Python tries to get next values.
First list still has:
2
remaining.
Second list has:
nothing
remaining.
Visual:
List 1 → [2]
List 2 → []
Lengths no longer match.
🔹 Step 6: strict=True Detects Mismatch
Python sees:
First iterable still has items
but
Second iterable is exhausted
This violates:
strict=True
So Python raises:
ValueError
🔹 Step 7: list() Never Completes
list(zip(...))
cannot finish.
Execution stops immediately with:
Final Output
ValueError
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