[Solved] What is wrong with this code snippet?from scipy.io import loadmat mat = loadmat('file.mat') print(mat['variable'])Assuming variable does not exist in file.mat. | SciPy

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What is wrong with this code snippet?

from scipy.io import loadmat
mat = loadmat('file.mat')
print(mat['variable'])

Assuming variable does not exist in file.mat.

AIt will print None

BIt will raise a KeyError because 'variable' is not in the file

CIt will create 'variable' with empty data

DIt will print an empty dictionary

Step-by-Step Solution

Solution:

Step 1: Understand dictionary key access
Accessing a non-existent key in a Python dictionary raises a KeyError.
Step 2: Apply to loadmat output
The loaded data is a dictionary; accessing a missing variable key causes KeyError.
Final Answer:
It will raise a KeyError because 'variable' is not in the file -> Option B
Quick Check:
Missing key access raises KeyError [OK]

Quick Trick: Check keys before accessing to avoid KeyError [OK]

Common Mistakes:

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