🔥 Python Developer Interview Preparation | 30+ Questions with Answers (SQL, OCR, Data Cleaning)

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📌 Python Developer Interview Preparation
✅ Python Basics
✅ OOP Concepts
✅ Decorators & Exception Handling
✅ Excel Automation
✅ PDF to Excel, OCR, Data Extraction
✅ Email Automation
✅ Dynamic Typing & Type Conversion
✅ String Operations (Join, Slice, +)
✅ Database Concepts (PostgreSQL, Ports, Inserts)
✅ SQL Queries (CREATE, INSERT, UPDATE)

Section 1: Introduction
1. Tell me about yourself.
Description: Give a 30–40 second summary — background, skills, experience, and current goals.
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Section 2: Python for Excel & Data Cleaning
2. What Excel-related activities have you done using Python? (Data cleaning, automation, transformation)
3. What is a data massager (data wrangling) and what tasks have you done?
4. Have you converted tables or PDFs into Excel? How did you do it?
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Section 3: Email Automation
5. Have you done mailing automation? Which library did you use?
6. What code or approach did you use to send emails or save attachments?
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Section 4: Lambda & OCR
7. What is a Lambda function in Python?
8. Have you processed image-based PDFs? Which OCR tool did you use?
(Example: Tesseract, EasyOCR, PaddleOCR)
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Section 5: Python Data Structures
9. What is the difference between a list, tuple, and dictionary?
10. Can we change values inside a dictionary?
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Section 6: Python Concepts
11. What is a decorator?
12. What is exception handling in Python? How do you implement it?
13. What is the purpose of the finally block?
14. How does Python implement dynamic typing?
15. What is implicit and explicit type conversion?
16. When taking input from a user, which keyword do we use?
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Section 7: String Operations
17. What is the join() method in Python?
18. What is the difference between using + and join() for string concatenation?
19. Explain slicing in Python.
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Section 8: OOPS Concepts
20. What is overriding and overloading?
21. What else can be overridden in Python besides methods?
22. Can the same class inherit from multiple classes? (Multiple inheritance)
23. What is a sealed class
24. What types of exceptions have you handled in your projects?
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Section 9: Databases
25. Have you done database-related activities?
26. Can you explain syntax to store data into a database?
(Ex. Insert statements, connection code)
27. Do you use only built-in libraries, or do you install external libraries for PostgreSQL?
28. Is any port required to connect to a database?
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Section 10: Version Control
29. Explain your workflow when pushing code to a remote repository?
30 How do CI/CD pipelines work?
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Section 11: SQL
31. Write SQL syntax for CREATE TABLE.
32. Write SQL syntax for INSERT and UPDATE statements.