python_一切皆对象

From Wikipedia

这里就解释了deepcopy和copy的区别, eg, deepcopy把list里面的对象复制再放入新建立的list对象当中, 但是copy只是copy list的对象, list的内容还是原来list的reference type

Language	Value type	Reference type
C++[3]	booleans, characters, integer numbers, floating-point numbers, arrays, classes (including strings, lists, dictionaries, sets, stacks, queues), enumerations	alias, pointers
Java[4]	booleans, characters, integer numbers, floating-point numbers	arrays, classes (including immutable strings, lists, dictionaries, sets, stacks, queues, enumerations), interfaces, null pointer
C#[5]	structures (including booleans, characters, integer numbers, floating-point numbers, fixed-point numbers, lists, dictionaries, sets, stacks, queues, optionals), enumerations	classes (including immutable strings, arrays, tuples, lists, dictionaries, sets, stacks, queues), interfaces, pointers
Swift[6][7]	structures (including booleans, characters, integer numbers, floating-point numbers, fixed-point numbers, immutable strings, tuples, lists, dictionaries, sets, stacks, queues), enumerations (including optionals)	functions, classes, interfaces
Python[8]		classes (including immutable booleans, immutable integer numbers, immutable floating-point numbers, immutable complex numbers, immutable strings, byte strings, immutable byte strings, immutable tuples, immutable ranges, immutable memory views, lists, dictionaries, sets, immutable sets, null pointer)
JavaScript[9]		immutable booleans, immutable floating-point numbers, immutable symbols, immutable strings, undefined, prototypes (including lists, null pointer)
OCaml[10][11]	immutable characters, immutable integer numbers, immutable floating-point numbers, immutable tuples, immutable enumerations (including immutable units, immutable booleans, immutable lists, immutable optionals), immutable exceptions, immutable formatting strings	arrays, immutable strings, byte strings, dictionaries (including pointers)