day10_hasattr和getattr、setattr、delattr和property的用法

class My:

    def __init__(self, x=0):
        self.x = x

my = My()
# hasattr判断对象(my)是否有'x'属性，打印True or False，只能是'x'，不能是x
print(hasattr(my, 'x'))  # 打印出True
# 从对象中获取'x'属性
print(getattr(my, 'x'))  # getattr打印出0
print(getattr(my, 'y'))  # 报AttributeError: 'My' object has no attribute 'y'错误
print(getattr(my, 'y', 'hello'))  # 打印出hello，如果不给个默认值就会报错，没有y属性
# setattr是给指定对象的属性设置一个值
setattr(my, 'z', 'test')
print(getattr(my, 'z'))  # 打印出test
# delattr是删除指定对象的属性，没有返回值
delattr(my, 'x')
delattr(my, 'x')  # 报AttributeError: x，因为已经删除过了，再删就报错了

import requests

class MyRequest:
    def __init__(self, url, method='get', data=None, headers=None, is_json=None):
        method = method.lower()
        self.url = url
        self.data = data
        self.headers = headers
        self.is_json = is_json
        if hasattr(self, method):  # 判断某个对象有没有某个方法，有打印True，没有打印False
            getattr(self, method)()  # 根据字符串调用对应的方法

    def get(self):  # 无论正常还是异常返回的都是一个字典
        try:
            req = requests.get(self.url, self.data, headers=self.headers).json()
        except Exception as e:
            self.response = {"error": "接口请求出错%s" % e}
        else:
            self.response = req

    def post(self):
        try:
            if self.is_json:
                req = requests.post(self.url, json=self.data, headers=self.headers).json()
            else:
                req = requests.post(self.url, self.data, headers=self.headers).json()
        except Exception as e:
            self.response = {"error": "接口请求出错%s" % e}
        else:
            self.response = req

if __name__ == '__main__':
    login = MyRequest('http://127.0.0.1:5000/login', data={'username': 'ssj', 'password': '123456'})
    print(login.response)
    session_id = login.response.get('session_id')
    data = {'session_id': session_id, 'money': 10000}
    m = MyRequest('http://127.0.0.1:5000/pay', data=data)
    print(m.response)