Python Test Questions and Answers: 20 MCQs + 5 Coding Questions

These Python test questions and answers are built for testers and freshers preparing for online assessments and data or ETL testing interviews in India. Try each question before opening the answer. The first half covers Python basics; the second half covers what data testing roles actually use: pandas and pytest.

Tip: save this page as a PDF from your browser (Ctrl+P → Save as PDF) for offline revision.

How to Use This Test

• Give yourself 20 minutes for the 20 MCQs.
• Write the 5 coding answers yourself before reading ours.
• Score yourself at the end and revise the topics you missed.

Python Basics (Q1–Q10)

Q1. What is the output of print(type([]))?

• A. <class 'tuple'>
• B. <class 'list'>
• C. <class 'dict'>
• D. <class 'set'>

Q2. Which of these is immutable?

• A. list
• B. dict
• C. tuple
• D. set

Q3. What does len("ETL") return?

• A. 2
• B. 3
• C. 4
• D. Error

Q4. What is 7 // 2?

• A. 3.5
• B. 3
• C. 4
• D. 1

Q5. What does "a,b,c".split(",") return?

• A. 'abc'
• B. ['a', 'b', 'c']
• C. ('a', 'b', 'c')
• D. ['a,b,c']

Q6. Which keyword handles an exception?

• A. catch
• B. except
• C. error
• D. handle

Q7. What is the output of bool("")?

• A. True
• B. False
• C. None
• D. Error

Q8. Which creates a dictionary?

• A. {1, 2}
• B. [1: "a"]
• C. {"id": 1}
• D. ("id", 1)

Q9. What does set([1, 1, 2]) give?

• A. {1, 1, 2}
• B. {1, 2}
• C. [1, 2]
• D. Error

Q10. What is [x * 2 for x in range(3)]?

• A. [0, 2, 4]
• B. [2, 4, 6]
• C. [0, 1, 2]
• D. [1, 2, 3]

pandas and pytest Questions for Testers (Q11–Q20)

Q11. Which pandas function reads a CSV file?

• A. pd.open_csv()
• B. pd.read_csv()
• C. pd.load_csv()
• D. pd.csv()

Q12. What does df.isna().sum() show?

• A. Total rows
• B. Missing values per column
• C. Duplicate rows
• D. Column types

Q13. Which finds duplicate order_id rows?

• A. df.unique("order_id")
• B. df.duplicated("order_id")
• C. df.drop("order_id")
• D. df.count("order_id")

Q14. Which merge finds rows missing in target?

• A. how="inner"
• B. how="left", indicator=True
• C. how="cross"
• D. concat()

Q15. What does assert a == b do in pytest when false?

• A. Prints a warning
• B. Fails the test
• C. Skips the test
• D. Nothing

Q16. Where are shared pytest fixtures usually placed?

• A. main.py
• B. conftest.py
• C. setup.cfg
• D. __init__.py

Q17. Which runs the same test for many inputs?

• A. @pytest.fixture
• B. @pytest.mark.parametrize
• C. @pytest.skip
• D. @staticmethod

Q18. Which library is commonly used to connect Python to SQL databases?

• A. NumPy
• B. SQLAlchemy
• C. Matplotlib
• D. Requests

Q19. What does df.groupby("region")["amount"].sum() return?

• A. One total
• B. Total amount per region
• C. Count per region
• D. Average per region

Q20. float("nan") == float("nan") is:

• A. True
• B. False
• C. Error
• D. None

Python Coding Test Questions (Q21–Q25)

Q21. Write a function that returns duplicate values in a list.

def duplicates(items):
    seen, dups = set(), set()
    for x in items:
        if x in seen:
            dups.add(x)
        seen.add(x)
    return dups

assert duplicates([1, 2, 2, 3, 3]) == {2, 3}

Q22. Count the words in a sentence.

from collections import Counter
print(Counter("data test data".split()))   # Counter({'data': 2, 'test': 1})

Q23. Reverse a string and check if it is a palindrome.

def is_palindrome(s):
    s = s.lower().replace(" ", "")
    return s == s[::-1]

assert is_palindrome("Madam")

Q24. Find IDs present in source but not in target (lists).

source = [101, 102, 103, 104]
target = [101, 103]
missing = sorted(set(source) - set(target))
print(missing)   # [102, 104]

Q25. Read a CSV and report columns with missing values.

import pandas as pd

df = pd.read_csv("customers.csv")
nulls = df.isna().sum()
print(nulls[nulls > 0])

Score Yourself

Tips for Online Python Tests

• Many Indian companies use online assessment platforms for the first round. The questions above are practice questions in a similar style, not questions from any specific platform.
• Read the full question before coding; edge cases (empty input, duplicates, NULL/NaN) are where marks are lost.
• Run small examples with print statements before submitting.
• Manage time: skip and return instead of getting stuck.

Practise Under Interview Conditions

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Frequently Asked Questions

What Python questions are asked in a test for freshers?

Data types, lists and dictionaries, loops, string methods, exceptions, simple functions and short coding tasks such as finding duplicates or reversing a string.

Which Python topics matter most for ETL or data testing roles?

pandas (read_csv, merge, groupby, isna, duplicated), pytest (assert, fixtures, parametrize) and connecting to databases with SQLAlchemy.

Can I download these Python test questions as a PDF?

Use your browser’s print option (Ctrl+P, then Save as PDF) to save this page.

Are these the actual questions from company online tests?

No. They are original practice questions in a similar style. Use them to build skill, not to memorise answers.

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Written by

Asim Noaman Lodhi

Certified Google Partner · QA Consultant · 12+ Years IT

QA consultant specializing in ETL testing and data quality. Trained 913+ students to transition into data testing roles through hands-on, real-world instruction.

4.5 Rating 913+ Students Google Partner 79 Lectures