我想我不理解
python的argparse基本知识.
我正在尝试将Google YouTube API用于python脚本,但我不了解如何在不使用命令行的情况下将值传递给脚本.
例如,here是API的示例. github和其他地方的示例将此示例显示为从命令行调用,在调用脚本时从该命令行传递argparse值.
我不想使用命令行.我正在构建一个使用装饰器获取用户登录凭据的应用程序,当该用户想要上传到他们的YouTube帐户时,他们会提交一个表单,然后调用此脚本并将argparse值传递给它.
如何从另一个python脚本将值传递给argparser(请参阅下面的YouTube上传API脚本中的部分代码)？
if __name__ == '__main__':
argparser.add_argument("--file",required=True,help="Video file to upload")
argparser.add_argument("--title",help="Video title",default="Test Title")
argparser.add_argument("--description",help="Video description",default="Test Description")
argparser.add_argument("--category",default="22",help="Numeric video category. " +
"See https://developers.google.com/youtube/v3/docs/videoCategories/list")
argparser.add_argument("--keywords",help="Video keywords,comma separated",default="")
argparser.add_argument("--privacyStatus",choices=VALID_PRIVACY_STATUSES,default=VALID_PRIVACY_STATUSES[0],help="Video privacy status.")
args = argparser.parse_args()
if not os.path.exists(args.file):
exit("Please specify a valid file using the --file= parameter.")
youtube = get_authenticated_service(args)
try:
initialize_upload(youtube,args)
except HttpError,e:
print "An HTTP error %d occurred:\n%s" % (e.resp.status,e.content)
编辑：每个请求,这里是我使用标准方法初始化字典或使用argparse创建字典的400错误的回溯.我以为我是因为形成错误的参数而得到这个,但也许不是：
Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py",line 1535,in __call__
rv = self.handle_exception(request,response,e)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py",line 1529,in __call__
rv = self.router.dispatch(request,response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py",line 1278,in default_dispatcher
return route.handler_adapter(request,line 1102,in __call__
return handler.dispatch()
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py",line 572,in dispatch
return self.handle_exception(e,self.app.debug)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py",line 570,in dispatch
return method(*args,**kwargs)
File "C:\Users\...\testapp\oauth2client\appengine.py",line 796,in setup_oauth
resp = method(request_handler,*args,**kwargs)
File "C:\Users\...\testapp\testapp.py",line 116,in get
resumable_upload(insert_request)
File "C:\Users\...\testapp\testapp.py",line 183,in resumable_upload
status,response = insert_request.next_chunk()
File "C:\Users\...\testapp\oauth2client\util.py",line 129,in positional_wrapper
return wrapped(*args,**kwargs)
File "C:\Users\...\testapp\apiclient\http.py",line 874,in next_chunk
return self._process_response(resp,content)
File "C:\Users\...\testapp\apiclient\http.py",line 901,in _process_response
raise HttpError(resp,content,uri=self.uri)
HttpError: <HttpError 400 when requesting https://www.googleapis.com/upload/youtube/v3/videos?alt=json&part=status%2Csnippet&uploadType=resumable returned "Bad Request">
解决方法
无论它是否是最好的方法,你真的要弄清楚.但是使用没有命令行的argparse很容易.我一直这样做,因为我有可以从命令行运行的批处理.或者也可以通过其他代码调用 – 这对于单元测试非常有用,如上所述.例如,argparse特别擅长默认参数.
从您的样本开始.
import argparse
argparser = argparse.ArgumentParser()
argparser.add_argument("--file",help="Video file to upload")
argparser.add_argument("--title",default="Test Title")
argparser.add_argument("--description",default="Test Description")
argparser.add_argument("--category",help="Numeric video category. " +
"See https://developers.google.com/youtube/v3/docs/videoCategories/list")
argparser.add_argument("--keywords",default="")
VALID_PRIVACY_STATUSES = ("private","public")
argparser.add_argument("--privacyStatus",help="Video privacy status.")
#pass in any positional or required variables.. as strings in a list
#which corresponds to sys.argv[1:]. Not a string => arcane errors.
args = argparser.parse_args(["--file","myfile.avi"])
#you can populate other optional parameters,not just positionals/required
#args = argparser.parse_args(["--file","myfile.avi","--title","my title"])
print vars(args)
#modify them as you see fit,but no more validation is taking place
#so best to use parse_args.
args.privacyStatus = "some status not in choices - already parsed"
args.category = 42
print vars(args)
#proceed as before,the system doesn't care if it came from the command line or not
# youtube = get_authenticated_service(args)
输出：
{'category': '22','description': 'Test Description','title': 'Test Title','privacyStatus': 'private','file': 'myfile.avi','keywords': ''}
{'category': 42,'privacyStatus': 'some status not in choices - already parsed','keywords': ''}