LLD - Design — Hotel Booking System
Which of the following is the correct syntax to check if a key 'slot1' exists in a Python dictionary named availability?
Which of the following is the correct syntax to check if a key 'slot1' exists in a Python dictionary named availability?
easy🧠 Conceptual Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Recall Python dictionary key existence syntax
In Python 3.x, the correct way to check if a key exists is using the 'in' keyword.Step 2: Analyze options
if 'slot1' in availability: uses 'in' correctly; 'has_key' was removed in Python 3; 'contains' and 'exists' are invalid methods.Final Answer:
if 'slot1' in availability: -> Option DQuick Check:
Python dict key check uses 'in' keyword [OK]
Quick Trick: Use 'in' keyword to check dict keys in Python 3+ [OK]
Common Mistakes:
MISTAKES- Using has_key() in Python 3
- Using non-existent methods like contains()
- Confusing syntax with other languages
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