我有一个函数,使用以下代码下载文件:
urllib.request.urlretrieve(url, filename, Handle_Progress)
Handle_Progress
是计算进度百分比的函数。标准函数接收3个参数:
Handle_Progress(blocknum, blocksize, totalsize)
对于我的程序,我需要传递第四个参数dlg.
我试着
urllib.request.urlretrieve(url, filename, Handle_Progress(dlg))
同时生成函数头
def Handle_Progress(dlg, blocknum, blocksize, totalsize):
``` but I get the following error:
>TypeError: Handle_Progress() missing 3 required positional arguments: 'blocknum', 'blocksize', and 'totalsize'`
How can I pass a 4th parameter to the `Handle_Progress` function?
使用λ
urllib.request.urlretrieve(url, filename,
lambda blocknum, blocksize, totalsize: Handle_Progress(dlg, blocknum, blocksize, totalsize)
)