Share iTunes playlist with another computer (Different account)
Drag the individual tracks to a USB key etc - this will initially lose the playlist data &amp; only copy the tracks themselves.  

To add an importable playlist to that, go to File > Library > Export Playlist, then save as M3U format &amp; add to the USB key. Your friend can then add the entire playlist by dragging just the M3U file to his iTunes - the tracks will be copied in automatically.

Alternatively, you can export a playlist by burning to CD/DVD
Right click the playlist title &amp; click Burn Playlist to Disk.
I'm not certain whether this will carry playlist information or just the tracks - it's been too long since I did it.

BTW - passing around AppleID information is really not recommended.
It's the way to lose control of your own devices, if ever used maliciously.