terror

def filter(func, iterable):
  return [el for el in iterable if func(el)]

def map(func, iterable):
  return [func(x) for x in iterable]

def reduce(func, iterable, init=None):
  it  = iter(iterable)
  val = next(it) if init is None else init

terror

class Meta(type):
  def __new__(cls, what, bases=None, dict=None):
    if 'area' not in dict:
      raise Exception("Area not found!")
    return type.__new__(cls, what, bases, dict)

class Shape(metaclass=Meta):
  def __init__(self, l, w):
    self.l = l
    self.w = w

terror

_='_=%r;print (_%%_)';print (_%_)

terror

import time
import functools

class Foo:
    def __init__(self, n = 1):
        self.n = n

    @functools.cached_property
    def expensive(self):
        return fib(self.n)

terror

def diff_a(a, b):
    return list(set(a) - set(b)) + list(set(b) - set(a))

def diff_b(lists):
    x = [list(set(i) - set(j)) for i in lists for j in lists]
    return list(set([item for sublist in x for item in sublist]))

def main():
    a = [1, 2, 3]; b = [1, 2, 5, 4]; c = [1, 3, 5, 6]
    print(diff_a(a, b))      # [3, 5, 4]

terror

# python functions are objects
# can be passed stored in variables, passed as args, returned, etc

def wrap(func):
    print("wow!")
    func()
    print("oo")

def hello():
    print("hello!")

terror

using System;
using System.Collections.Generic;

class Program {
  static void Main(string[] args) {
    List<List<int>> arr = new List<List<int>>();

    // -> []

    for(int i = 0; i < 10; ++i) {

terror

using System;
using static System.Console;

class Program {
  static void Main(string[] args) {
    Write("Number of rows: ");
    int r = int.Parse(ReadLine()); // 5

    Write("\nNumebr of cols: ");
    int c = int.Parse(ReadLine()); // 3

terror

from typing import List

R, C = 3, 3


def construct(board: List[List[int]]) -> str:
    """
    Constructs a tic tac toe board string based
    on a 2D list

terror