Reference library
Lists & loops
Iterate, transform, and combine sequences with readable Python patterns.
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Lists & loops
medium
List comprehension filter
Build a new list in one line by filtering and transforming items.
lists
comprehension
filter
Python
numbers = [1, 2, 3, 4, 5, 6, 7, 8]
doubled_evens = [n * 2 for n in numbers if n % 2 == 0]
print(doubled_evens)
names = ["ada", "linus", "guido"]
title_case = [name.title() for name in names if name]
print(title_case)
4
0
Open
Lists & loops
easy
Enumerate with index
Loop with both index and value — cleaner than manual counters.
loops
enumerate
lists
Python
tasks = ["read docs", "write code", "run tests"]
for i, task in enumerate(tasks, start=1):
print(f"{i}. {task}")
5
0
Open
Lists & loops
easy
Zip two lists
Pair items from parallel lists and iterate them together.
lists
zip
loops
Python
names = ["Ada", "Grace", "Katherine"]
scores = [98, 95, 100]
for name, score in zip(names, scores):
print(f"{name}: {score}")
print(list(zip(names, scores)))
3
0
Open
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