How to call functions as those?-CodePudding

I tried to download a video using this code;

from youtube_dl import YoutubeDL

def opts():
    url= "https://www.youtube.com/watch?v=ffcitRgiNDs"

    ydl_opts= {
        'format': '22'
    }
opts()

def download(url, ydl_opts):
    YoutubeDL(ydl_opts).download(url)
download()

And I got this error!

TypeError: download() missing 2 required positional arguments: 'url' and 'ydl_opts'

How to call fuctions like this. 'def download(url, ydl_opts)'. Can't call 'download()'

CodePudding user response：

You are defining local variables in opts that don't affect the outer scope. You could use global variables (not recommended) or return values from opts.

def opts():
    url= "https://www.youtube.com/watch?v=ffcitRgiNDs"

    ydl_opts= {
        'format': '22'
    }
    return url, ydl_opts

Now you can use

url, ydl_opts = opts()
download(url, ydl_opts)

download(*opts())

If you want download to take no parameters, call opts in download.

def download():
    url, ydl_opts = opts()
    YoutubeDL(ydl_opts).download(url)

CodePudding user response：

you can use Global variables

from youtube_dl import YoutubeDL

def opts():
    global url
    url= "https://www.youtube.com/watch?v=ffcitRgiNDs"

    global ydl_opts
    ydl_opts= {
        'format': '22'
    }
opts()

def download(url, ydl_opts):
    YoutubeDL(ydl_opts).download(url)
download(url,ydl_opts)