1. What will be the output of the following code?

def add_item(item, lst=None):
    if lst is None:
        lst = []
    lst.append(item)
    return lst

print(add_item(1))
print(add_item(2))

A. [1] then [2]
B. [1] then [1, 2]
C. [] then []
D. Raises TypeError
Correct answer: A.

2. What is printed by this code?

x = 10
def func():
    print(x)
    x = 5

func()

A. 10
B. 5
C. None
D. UnboundLocalError
Correct answer: D.

3. What is the result of executing this code?

a = [1, 2, 3]
b = a[:]
a.append(4)
print(b)

A. [1, 2, 3, 4]
B. [4]
C. [1, 2, 3]
D. []
Correct answer: C.

4. What does the following expression evaluate to?

bool("False")

A. False
B. True
C. Raises ValueError
D. None
Correct answer: B.

5. What will be the output?

print(type({}))

A. <class 'list'>
B. <class 'set'>
C. <class 'dict'>
D. <class 'tuple'>
Correct answer: C.

6. What is printed by this code?

x = (1, 2, [3])
x[2] += [4]
print(x)

A. (1, 2, [3])
B. (1, 2, [3, 4])
C. TypeError
D. AttributeError
Correct answer: C.

7. What does this code output?

print([i for i in range(3) if i])

A. [0, 1, 2]
B. [1, 2]
C. [0]
D. []
Correct answer: B.

8. What will be printed?

d = {"a": 1}
print(d.get("b", 2))

A. None
B. KeyError
C. 2
D. "b"
Correct answer: C.

9. What is the output?

print(1 in [1, 2], 1 is 1)

A. True True
B. True False
C. False True
D. False False
Correct answer: A.

10. What does this code produce?

def gen():
    for i in range(2):
        yield i

g = gen()
print(next(g), next(g))

A. 0 1
B. 1 2
C. 0 0
D. StopIteration
Correct answer: A.

11. What is printed?

print({x: x*x for x in range(2)})

A. {0, 1}
B. {0: 0, 1: 1}
C. [(0,0),(1,1)]
D. Error
Correct answer: B.

12. What is the result of this comparison?

print([] == [], [] is [])

A. True True
B. False False
C. True False
D. False True
Correct answer: C.

13. What will be printed?

def f():
    try:
        return "A"
    finally:
        print("B")

print(f())

A. A
B. B
C. B then A
D. A then B
Correct answer: C.

14. What does this code output?

x = [1, 2]
y = x
x = x + [3]
print(y)

A. [1, 2, 3]
B. [3]
C. [1, 2]
D. Error
Correct answer: C.

15. What is printed?

print(type(i for i in range(3)))

A. <class 'list'>
B. <class 'tuple'>
C. <class 'generator'>
D. <class 'range'>
Correct answer: C.

🔥 NEW YEAR 2026 – PREMIUM SCIENTIFIC PAPER WRITING OFFER 🔥
Q1-Ready | Journal-Targeted | Publication-Focused

Serious researchers, PhD & MSc students, postdocs, universities, and funded startups only.

To start 2026 strong, we’re offering a limited New Year scientific writing package designed for fast-track publication, not academic busywork.

🎯 What We Offer (End-of-Year Special):

✍️ Full Research Paper Writing – $400
(Q1 / Q2 journal–ready)

Includes:
✅ Journal-targeted manuscript (Elsevier / Springer / Wiley / IEEE / MDPI)
✅ IMRAD structure (Introduction–Methods–Results–Discussion)
✅ Strong problem formulation & novelty framing
✅ Methodology written to reviewer standards
✅ Professional academic English (native-level)
✅ Plagiarism-free (Turnitin <10%)
✅ Ready for immediate submission

📊 Available Paper Types:

Original Research Articles

Review & Systematic Review

AI / Machine Learning Papers

Engineering & Medical Research

Health AI & Clinical Data Studies

Interdisciplinary & Applied Research

🧠 Optional Add-ons (if needed):

Journal selection & scope matching

Cover letter to editor

Reviewer response (after review)

Statistical validation & result polishing

Figure & table redesign (publication quality)

🚀 Why This Is Different
We don’t “write generic papers.”
We engineer publishable research.

✔️ Real novelty positioning
✔️ Reviewer-proof logic
✔️ Data-driven arguments
✔️ Aligned with current 2025–2026 journal expectations

Many of our papers are built on real-world datasets and are already aligned with Q1 journal standards.

⏳ New Year Offer – Limited Time

Regular price: $1,500 – $3,000

New Year 2026 price: $400

Limited slots (quality > quantity)

🎓 Priority given to:

PhD / MSc students

Active researchers

Funded startups

Universities & labs

📩 DM for details, samples & timelines
Contact:
@Omidyzd62

Start 2026 with a submitted paper—not just a plan

A cheat sheet about functions and techniques in Python: shows useful built-in functions, working with iterators, strings, and collections, as well as popular tricks with unpacking, zip, enumerate, map, filter, and dictionaries

@DataScience4