🧠 Quiz: What is the most "Pythonic" way to create a new list containing the squares of numbers from an existing list called nums?

A) Using a for loop and the .append() method.
B) new_list = [num**2 for num in nums]
C) Using a while loop with an index counter.
D) new_list = (num**2 for num in nums)

✅ Correct answer: B

Explanation: This is a list comprehension. It's a concise, readable, and often faster way to create a new list from an iterable compared to a traditional for loop. Option D creates a generator expression, not a list.

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By: @DataScienceQ ✨

🧠 Quiz: What is the most Pythonic way to create a new list containing the squares of numbers from 0 to 4?

A) squares = [x**2 for x in range(5)]
B) squares = list(map(lambda x: x**2, range(5)))
C) squares = []
for x in range(5):
squares.append(x**2)

✅ Correct answer: A

Explanation: List comprehensions are a concise and highly readable way to create lists from other iterables. While the other options work, a list comprehension is generally considered the most "Pythonic" for its clarity and efficiency in this context.

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By: @DataScienceQ ✨

Python tip:

itertools.zip_longest pairs elements from multiple iterables, but unlike the built-in zip(), it continues until the longest iterable is exhausted, padding shorter ones with a specified fillvalue.

While zip() truncates its output to the length of the shortest input, zip_longest() ensures no data is lost from longer inputs by substituting None (or a custom value) for missing items.

Example👇

>>> import itertools
>>> students = ['Alice', 'Bob', 'Charlie', 'David']
>>> scores = [88, 92, 75]
>>> grades = list(itertools.zip_longest(students, scores, fillvalue='Absent'))
grades
[('Alice', 88), ('Bob', 92), ('Charlie', 75), ('David', 'Absent')]

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By: @DataScienceQ ✨