A collection of useful built-in Python functions that most juniors haven't touched

1️⃣ all and any: a mini rule engine
— all(iterable) returns True if all elements are true
— any(iterable) returns True if at least one is true
Example:

password = "P@ssw0rd123"
checks = [
    len(password) >= 8,
    any(c.isdigit() for c in password),
    any(c.isupper() for c in password),
]

if all(checks):
    print("password is ok")

— You can quickly build readable policy checks without a forest of ifs

2️⃣ enumerate: a handy counter instead of manual indexing
Instead of for i in range(len(list)):

users = ["alice", "bob", "charlie"]
for idx, user in enumerate(users, start=1):
    print(idx, user)

— You get both the index and the value at once. Less chance to shoot yourself in the foot with off-by-one errors

3️⃣ zip: linking multiple sequences

names  = ["alice", "bob", "charlie"]
scores = [10, 20, 15]
for name, score in zip(names, scores):
    print(name, score)

— You can glue several lists into one stream of tuples, do parallel iteration, nicely combine data without manual indices

4️⃣ reversed: reverse without copying

data = [1, 2, 3, 4]
for x in reversed(data):
    print(x)

— reversed returns an iterator, not a new list, which is convenient when you don't want to allocate extra memory

5️⃣ set and frozenset: uniqueness and fast lookup

items = ["a", "b", "a", "c"]
unique = set(items)  # {'a', 'b', 'c'}
if "b" in unique:
    ...

— A great way to kill duplicates and speed up membership checks, plus frozenset is hashable

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