eSthenos Technologies Senior Python Developer Interview Questions and Answers

One Medium level DSA question

Q1. Difference between list and tuple
Ans. 
List is mutable, tuple is immutable in Python.
• List can be modified, tuple cannot be modified

• List uses square brackets [], tuple uses parentheses ()

• List is slower than tuple for iteration and indexing

• List is used when you need a collection of items that can be changed, tuple is used for fixed collection of items
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Q2. Output of the list from slicing
Ans. 
Slicing a list in Python returns a new list containing a subset of elements from the original list.
• Slicing syntax: list[start:end:step]

• Start index is inclusive, end index is exclusive

• Omitting start index defaults to beginning of list, omitting end index defaults to end of list

• Negative indices count from the end of the list

• Examples: list[1:4] returns elements at index 1, 2, 3; list[:3] returns elements at index 0, 1, 2
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Q3. Python Decorator
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Q4. How to create database from python
Ans. 
You can create a database from Python using libraries like SQLAlchemy or Django ORM.
• Use SQLAlchemy library to create a database in Python

• Define database models using classes in SQLAlchemy

• Use Django ORM to create a database in Python

• Run database migrations to create tables in Django ORM
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