Why does csv.DictReader return an OrderedDict instead of a regular dictionary in Python versions before 3.7?

hard📝 Conceptual Q10 of 15

Python - Structured Data Files

Why does csv.DictReader return an OrderedDict instead of a regular dictionary in Python versions before 3.7?

ATo automatically convert values to correct types

BBecause regular dicts cannot store string keys

CTo improve performance when reading large files

DTo preserve the order of columns as in the CSV header

Step-by-Step Solution

Solution:

Step 1: Recall dictionary behavior before Python 3.7
Regular dicts did not preserve insertion order before Python 3.7.
Step 2: Understand why order matters in CSV reading
Preserving column order helps keep data consistent with CSV layout.
Final Answer:
To preserve the order of columns as in the CSV header -> Option D
Quick Check:
OrderedDict preserves CSV column order pre-Python 3.7 [OK]

Quick Trick: OrderedDict keeps CSV columns in original order before Python 3.7 [OK]

Common Mistakes:

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