python ~ youtube-dl: error: no such option: --audio-format -


here code : 

call(['youtube-dl', '-i', '--extract-audio', '--audio-format mp3','-w','ytsearch:'+song ,'-o '+song2file(song)+'.%(ext)s'], shell=false)

note:this implementation of code : youtuble-dl -i --extract-audio --audio-format mp3 -w ytsearch:wham bam -o whambam.%(ext)s song = wham bam, when run cmd works python implementation not working.

on running it, returns me error:

youtube-dl: error: no such option: --audio-format


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