CODEWITHSUNDEEP
pythonsubprocess
AB49K
AB49K

Reputation: 3425

Subprocess.Popen argument not passing to new process

musicdb[56] is "C:\\Users\\Andrew\\song.mp3"

So I'm trying to pass a song onto mplayer, it works if I quote the song like like:

player = subprocess.Popen(["mplayer", "C:\\Users\\Andrew\\song.mp3"], creationflags = subprocess.CREATE_NEW_CONSOLE)

but

player = subprocess.Popen(["mplayer", musicdb[56]], creationflags = subprocess.CREATE_NEW_CONSOLE)

Doesn't work even though musicdb[56] is exactly the same string as used in the first example.

Can anyone explain why? I can't find anything on google.

Upvotes: 0

Views: 148

Answers (1)

Aaron Digulla
Aaron Digulla

Reputation: 328810

To debug issues like this, I use this approach:

cmd = ["mplayer", musicdb[56]]
print repr(cmd)
subprocess.Popen(cmd, ...)

Using repr, you can see all the odd stuff that might be hiding in an innocently looking string (like, for example, extra new line characters at the end).

Upvotes: 3

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