Please don't use these Python instruments

example_00_please_no_named_tuples.py

from collections import namedtuple
from dataclasses import dataclass
# from typing import NamedTuple

# Point = namedtuple("Point", "x, y")
AgeAndWeight = namedtuple(
    "AgeAndWeight",
    "age, weight",
)


# class Point(NamedTuple):
#     x: int
#     y: int

@dataclass(slots=True, frozen=True)
class Point:
    x: int
    y: int


def main():
    p1 = Point(1, 2)
    print(p1)
    # x1, y1 = p1
    x1 = p1.x
    y1 = p1.y
    print(x1, y1)
    print(p1.x.bit_count())

    p2 = Point("one", "two")
    print(p2.x.title())
    print(Point.mro())

    a_w = AgeAndWeight(20, 87)
    print(a_w)
    print("age:", a_w.age)
    p3 = Point(20, 87)
    print("a_w == p3?", a_w == p3)
    print((1, 2) == (1, 2))

    # print(p3.x)
    # p3.x = 10
    # print(p3.x)
    #
    # p3.z = 7
    # print(p3.z)


if __name__ == "__main__":
    main()

example_01_please_no_lambdas.py

import operator
from operator import attrgetter
from operator import itemgetter
from dataclasses import dataclass, field
from random import randint, random


@dataclass
class Rating:
    value: float = field(default_factory=random)


@dataclass
class Person:
    name: str
    age: int
    rating: Rating = field(default_factory=Rating)


def run_operation(op, values):
    return list(map(op, *values))


def main():
    values = [
        (1, 2),
        (3, 5),
        (7, 9),
        (99, 9),
        (1, 1),
        # (1, 2, 3),
    ]
    numbers = list(map(lambda x: x[0] + x[1], values))
    print(numbers)

    numbers = list(map(lambda x: sum(x), values))
    print(numbers)

    numbers = list(map(sum, values))
    print(numbers)

    numbers = [sum(x) for x in values]
    print(numbers)
    print(run_operation(lambda a, b: a + b, zip(*values)))
    print(run_operation(operator.add, zip(*values)))
    print(run_operation(operator.sub, zip(*values)))
    print(run_operation(operator.mul, zip(*values)))
    print(run_operation(operator.eq, zip(*values)))

    numbers = [randint(1, 10) for _ in range(20)]
    print(numbers)
    target = 7
    print(numbers.index(target))
    # count = sum(x == target for x in numbers)
    count = operator.countOf(numbers, target)
    print("Count of", target, ":", count)

    first = ("foo", "bar")
    second = ("spam", "eggs")
    for line in map(operator.concat, first, second):
        print(line)

    persons = [
        Person("Bob", 33),
        Person("Alice", 50),
        Person("Nick", 42),
    ]
    print("sorted by name")
    sorted_by_name = sorted(persons, key=attrgetter("name"))
    for p in sorted_by_name:
        print(p)

    print("sorted by age")
    sorted_by_age = sorted(persons, key=attrgetter("age"))
    for p in sorted_by_age:
        print(p)

    pairs = [
        ("a", 5),
        ("b", 4),
        ("c", 7),
        ("d", 6),
    ]
    print(pairs)
    pairs.sort(key=itemgetter(1))
    print(pairs)

    users = [
        {
            "id": 1,
            "name": "John",
        },
        {
            "id": 2,
            "name": "Bob",
            "username": "bob",
        },
        {
            "id": 3,
            "name": "Bob",
            "username": "bob1",
        },
    ]
    print(users)
    users.sort(key=itemgetter("id"), reverse=True)
    print(users)
    users.sort(key=itemgetter("name"))
    print(users)
    users.sort(key=itemgetter("name", "id"))
    print(users)

    print(itemgetter("name", "id")(users[0]))
    print(attrgetter("name", "age")(persons[1]))
    print(attrgetter("name", "age", "rating")(persons[1]))
    print(attrgetter("name", "age", "rating.value")(persons[1]))


if __name__ == "__main__":
    main()

example_02_please_no_exec_or_eval.py

def main():
    # res = 2 + 2 * 2
    expr = "2 + 2 * 2"
    res = eval(expr)
    print("Expr", repr(expr), "res:", res)
    # expr_list_dir = "os.listdir()"
    # dirs = eval(expr_list_dir)
    # print(dirs)
    #
    # expr_rm = 'os.remove("secret.txt")'
    # eval(expr_rm)

    import_and_rm = "import os; os.remove('secret.txt')"
    exec(import_and_rm)


if __name__ == '__main__':
    main()