https://snakify.org/lessons/if_then_else_conditions/ - if/else x = int(input())if x > 0: print(x)else: print(-x) - abs() : 절댓값 x = int(input())print(abs(x)) // 절댓값. input : 10 / output : 10input : -10 / output : 10 - bool print(bool(-10)) # Trueprint(bool(0)) # False - zero is the only false numberprint(bool(10)) # True print(bool('')) # False - empty string is the only false stringprint(bool('a..