Tech With Galvan

🧪 Practice: Power Tools

Comprehensions, generators, and modules — the Module 10 toolkit, under pressure. Solutions at the bottom.

Exercise 1 — Comprehension warmups

Rewrite each loop as a one-line comprehension:

code

# A
result = []
for n in range(1, 11):
    if n % 2 == 0:
        result.append(n * n)

# B
names = ["aarav", "diya", "kabir"]
caps = []
for n in names:
    caps.append(n.upper())

# C
words = ["hi", "hello", "hey", "greetings"]
short = []
for w in words:
    if len(w) <= 4:
        short.append(w)

Exercise 2 — The data cleaner

Given this messy list, produce a clean list of proper-cased, stripped names — one comprehension:

code

raw = ["  aarav sharma ", "DIYA PATEL", "  kabir singh ", "Meera IYER"]
# Expected: ['Aarav Sharma', 'Diya Patel', 'Kabir Singh', 'Meera Iyer']

*(Hint: .title() capitalizes each word.)*

Exercise 3 — Dict comprehension workout

From marks = {"Aarav": 92, "Diya": 45, "Kabir": 78, "Meera": 88}, build:

A dict of only passing students (marks >= 50)

A dict mapping each name to "Pass"/"Fail"

The highest scorer's name (no comprehension needed for this one — use max with a key!)

Exercise 4 — The lazy sequence

Write a generator function even_numbers(limit) that yields even numbers from 0 up to limit. Loop it to print evens below 12.

Exercise 5 — The module split

Create two files: utils.py containing a clean_name(name) function (strip + title-case), and main.py that imports it and processes this list:

code

raw = ["  aarav ", "DIYA"]
# main.py prints: ['Aarav', 'Diya']

Add the if __name__ == "__main__": guard to main.py properly.

Solutions

Exercise 1:

code

# A
result = [n * n for n in range(1, 11) if n % 2 == 0]

# B
caps = [n.upper() for n in names]

# C
short = [w for w in words if len(w) <= 4]

Exercise 2:

code

clean = [name.strip().title() for name in raw]
print(clean)

Exercise 3:

code

marks = {"Aarav": 92, "Diya": 45, "Kabir": 78, "Meera": 88}

passing = {name: m for name, m in marks.items() if m >= 50}
# {'Aarav': 92, 'Kabir': 78, 'Meera': 88}

results = {name: ("Pass" if m >= 50 else "Fail") for name, m in marks.items()}
# {'Aarav': 'Pass', 'Diya': 'Fail', 'Kabir': 'Pass', 'Meera': 'Pass'}

topper = max(marks, key=lambda name: marks[name])
# 'Aarav'

Exercise 4:

code

def even_numbers(limit):
    n = 0
    while n < limit:
        yield n
        n += 2

for even in even_numbers(12):
    print(even)      # 0 2 4 6 8 10

Exercise 5:

code

# utils.py
def clean_name(name):
    return name.strip().title()

code

# main.py
from utils import clean_name

def main():
    raw = ["  aarav ", "DIYA"]
    clean = [clean_name(name) for name in raw]
    print(clean)      # ['Aarav', 'Diya']

if __name__ == "__main__":
    main()

✅ Module 10 Checkpoint

Comprehensions compressing loops, generators streaming lazily, code split into modules. Your Python just became *Pythonic*.

Next module: The Ecosystem — pip, environments, requests, and Git. Where your code meets the world.