python 给类 传参 为什么接收不到参数 打印出来是None?

Question

定义一个类
class ZApi:
    def __init__(self, symbol, access_key=None ,secret_key=None, passphrase=None ,host=None):
        self._host =  host

        def  request(self, uri):
            ..........
            
使用类
host="http://localhost:8083" 
zApi = ZApi( host)

结果
url = urljoin(self._host, uri)
print(self._host)

打印值为 None

到底是哪里出错了?

Answer 1

from urllib.parse import urljoin

class ZApi:
    def __init__(self, symbol, access_key=None, secret_key=None, passphrase=None, host=None):
        self._host = host

    def request(self, uri):
        url = urljoin(self._host, uri)
        print(url)

# 使用类
symbol = "BTC"
access_key = "your_access_key"
secret_key = "your_secret_key"
passphrase = "your_passphrase"
host = "http://localhost:8083"

zApi = ZApi(symbol, access_key, secret_key, passphrase, host)
zApi.request("/endpoint")