tebeka

fmt.Println(unsafe.Sizeof(filePerm)) // 1
var p Perm
fmt.Println(unsafe.Sizeof(p)) // 3

tebeka

type Perm struct {
    Read    bool
    Write   bool
    Execute bool
}

tebeka

filePerm := Read | Write // set permission (| is bitwise OR)
if filePerm&Write != 0 { // check permission (& is bitwise AND)
    fmt.Println("can write")
}

tebeka

func (p FilePerm) String() string {
    switch p {
    case Read:
        return "read"
    case Write:
        return "write"
    case Execute:
        return "execute"
    }

tebeka

type FilePerm uint8

const (
    Read FilePerm = 1 << iota
    Write
    Execute
)

func main() {
    fmt.Println(Execute) // execute

tebeka

In [5]: c._Client__address
Out[5]: 'https://httpbin.org:443'

tebeka

class SocketClient(Client):
    def __init__(self, host, port):
        self.__address = (host, port)

tebeka

In [4]: vars(c)
Out[4]: {'_Client__address': 'https://httpbin.org:443'}

tebeka

$ ipython
In [1]: %run client.py
In [2]: c = Client('httpbin.org', 443)
In [3]: c.__address
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Input In [3], in <module>
----> 1 c.__address

AttributeError: 'Client' object has no attribute '__address'

tebeka

from urllib.request import URLError, urlopen
from http import HTTPStatus


class Client:
    def __init__(self, host, port):
        self.__address = f'https://{host}:{port}'

    def health(self):
        url = f'{self.__address}/health'