Pythonic Code

Pythonic Code

SI	Concept	Symbol / Function	Description	Usage Scenario
1	One-liner	; or compressed logic	Single line expressions or statements.	Quick scripts or clean outputs.
2	List Comprehension	[x for x in ...]	Create lists with filter/map logic.	Filtering, mapping.
3	any() / all()	any(), all()	Check boolean condition on iterable.	Validation checks.
4	sorted() with lambda	sorted(..., key=lambda)	Custom sorting logic.	Sorting complex data.
5	Ternary Operator	x if cond else y	Conditional assignment.	Short if-else logic.
6	zip()	zip(a, b)	Loop over multiple iterables.	Parallel iteration.
7	enumerate()	enumerate(list)	Index + value in loops.	Indexed looping.
8	Unpacking	a, b = [1, 2]	Assign multiple variables at once.	Working with tuples/lists.
9	Set & Dict Comprehension	{x for x in ...} / {k:v}	Similar to list comprehension but for sets/dicts.	Create unique elements or filtered dicts.
10	dict.get() / setdefault()	d.get(k) / d.setdefault()	Avoid KeyError, provide default values.	Cleaner dictionary access.
11	Context Managers with with	with open(...) as ...:	Automatically handles file/resource cleanup.	File handling, locks, DB connections.

---

Code Samples

One-liner

result = sum([i for i in range(10)])  # returns 45

List Comprehension

squares = [x**2 for x in range(10)]

any() / all()

nums = [0, 1, 2]
print(any(nums))  # True
print(all(nums))  # False

sorted() with lambda

data = [{'name': 'John', 'age': 25}, {'name': 'Jane', 'age': 20}]
print(sorted(data, key=lambda x: x['age']))

zip()

names = ['a', 'b']
marks = [90, 80]
for name, mark in zip(names, marks):
    print(f"{name} scored {mark}")

Second enumerate()

fruits = ['apple', 'banana']
for i, fruit in enumerate(fruits):
    print(f"{i}: {fruit}")

Set & Dict Comprehensions

unique = {x for x in [1, 1, 2, 3]}
squared = {x: x**2 for x in range(5)}

dict.get() / setdefault()

data = {"a": 1}
print(data.get("b", 0))  # 0
data.setdefault("c", 5)
print(data)  # {'a': 1, 'c': 5}

Context Manager (with)

with open("file.txt", "r") as f:
    for line in f:
        print(line.strip())

Ternary Operator

score = 85
status = "Pass" if score >= 50 else "Fail"