QNetworkAccessManager是Qt自带的一个网络请求库，网上很多说的很模糊，在这总结一下

# coding: utf-8
import json
import sys
from pathlib import Path
from typing import Union
from urllib.parse import urlencode

from PyQt5.QtNetwork import QNetworkRequest, QNetworkAccessManager, QNetworkReply, QHttpMultiPart, QHttpPart
from PyQt5.QtCore import QUrl, pyqtSignal, QByteArray, QJsonDocument, QCoreApplication, QObject, QFile, QIODevice


class NetworkRequestsManager(QObject):
    finished = pyqtSignal(QNetworkReply)

    def __init__(self, parent=None, *, encoding='utf-8'):
        super().__init__(parent)
        self._reply = None  # type: QNetworkReply
        self._encoding = encoding
        self.networkAccessManager = QNetworkAccessManager(parent)
        self.networkAccessManager.finished.connect(self.finished)

    def get(self, url: Union[str, QUrl], params=None, headers=None):
        request = QNetworkRequest(self.__initUrl(url, params))
        self.__initHeaders(request, headers)
        self.networkAccessManager.get(request)

    def post(self, url: Union[str, QUrl], params: dict = None, json: dict = None, headers: dict = None):
        request = QNetworkRequest(self.__initUrl(url, params))
        self.__initHeaders(request, headers)
        self.networkAccessManager.post(request, self.__initJson(json))

    def file_post(self, url: Union[str, QUrl], file: dict, headers: dict = None):
        request = QNetworkRequest(self.__initUrl(url, params))
        multiPart = QHttpMultiPart(QHttpMultiPart.FormDataType)

        for item in file.items():
            httpPart = QHttpPart()
            file = QFile(item[1])
            file.open(QIODevice.ReadOnly)
            httpPart.setHeader(
                QNetworkRequest.ContentDispositionHeader,
                f'form-data; name="{item[0]}"; filename="{Path(item[1]).name}"'
            )
            httpPart.setBodyDevice(file)
            file.setParent(multiPart)
            multiPart.append(httpPart)
        self.__initHeaders(request, headers)
        self.networkAccessManager.post(request, multiPart)

    def __initUrl(self, url: Union[str, QUrl], params: dict = None) -> QUrl:
        if isinstance(url, str):
            url = QUrl(url)
        url.setQuery(urlencode(params), QUrl.ParsingMode.TolerantMode)
        return url

    def __initHeaders(self, request: QNetworkRequest, headers: dict = None):
        if headers is None:
            return
        for item in headers.items():
            request.setRawHeader(item[0].encode(), item[1].encode())

    def __initJson(self, json: dict = None):
        if json is None:
            return
        return QJsonDocument(json).toJson()


if __name__ == '__main__':
	# 这是一个联想壁纸的接口
    app = QCoreApplication(sys.argv)
    manager = NetworkRequestsManager()
    params = {
        "skip": "0",
        "limit": "54",
        "count": "76873",
        "tagId": "-1",
        "colorId": "-1",
        "classId": "-1",
        "refresh": "true",
        "priceId": "0"
    }
    url = 'https://pc-store.lenovomm.cn/wallpapercontent/wallpaper/class_wallpaper_list'
    headers = {
        "token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzbWJPcHRpb25zIjoiMSIsImJ1c2luZXNzS2V5IjoiIiwiY2hhbm5lbCI6IjIwMDA1IiwiZnJvbSI6ImluZHN0b3JlIiwidmVyc2lvbk5hbWUiOiI5LjAuMTMzMC4yMDEiLCJleHAiOjIzNDI4NjY3NzEsInZlcnNpb25Db2RlIjoiOS4wLjEzMzAuMjAxIn0.2_R46WPaT2BCy_NcbewdfosiSlLEMdNRX9cJIoqb6eY",
        "user-agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36&PCStore"
    }
    manager.get(QUrl(url), params, headers=headers)


    def response(reply: QNetworkReply):
        if reply.error() == reply.NoError:
            print(json.loads(reply.readAll().data().decode('utf-8')))
        else:
            print(reply.errorString())


    manager.finished.connect(response)
    sys.exit(app.exec_())