gmail驱动器访问令牌已过期

Question

我写了一个代码将文件从本地PC上传到我的gmail驱动器，为此我获得了访问令牌，这是我的代码，可以正常工作，但是令牌在短时间后过期：

def upload_1():

    headers = {"Authorization": "Bearer #acess token"} #put ur access token after the word 'Bearer '
    qassam = glob.glob("/root/Downloads/*.pdf")
    for i in qassam:
        qassam = "\n".join(qassam)  
        print i


        para = {
            "name": (i), #file name to be uploaded
            "parents": ["folderid"] # make a folder on drive in which you want to upload files; then open that folder; the last thing in present url will be folder id
        }
        files = {
            'data': ('metadata', json.dumps(para), 'application/json; charset=UTF-8'),
            'file': ('application/zip',open(i, "rb")) # replace 'application/zip' by 'image/png' for png images; similarly 'image/jpeg' (also replace your file name)
        }
        r = requests.post(
            "https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart",
            headers=headers,
            files=files
        )
        print(r.text)


upload_1()

无论如何，过期后是否有刷新我的访问令牌而无需打开网页和.... etc的意思，我的意思是我需要从python进行操作