1. immutable : unchanging over time or unable to be changed String are immutable: Strings are cannot change once created. Instead, an assignment statement must be used. x = 10 print(id(x)) #1384163392 def add5_to_x(a): print(id(a)) # 1384163392 a = a + 5 return a x = add5_to_x(x) print(id(x)) #1384163472 x = add5_to_x(x) -> reassign 한 것이기 때문에 memory주소가 달라짐. (값 자체가 달라졌기 때문에 다른 곳을 reference) pytho..
