docs: def set_volume(percentage):
  	'''Set the volume.
  
  	Sets the volume to a given percentage (integer between 0 and 100).
  
  	Args:
  			percentage (int): The percentage (as a 0 to 100 integer) to set the volume to.
  
  	Raises:
  			ValueError: if the percentage is >100 or <0.
  	'''
  
  	if percentage > 100 or percentage < 0:
  		raise ValueError('percentage must be an integer between 0 and 100')
  
  	if system.get_name() == 'windows':
  		# TODO: Implement volume for Windows. Looks like WinAPI is the
  		# solution...
  		pass
  
  	elif system.get_name() == 'mac':
  		# OS X uses 0-10 instead of percentage
  		volume_int = percentage / 10
  
  		sp.Popen(['osascript', '-e', 'set Volume %d' % volume_int]).wait()
  
  	else:
  		# Linux/Unix
  		formatted = str(percentage) + '%'
  		sp.Popen(['amixer', '--quiet', 'sset', 'Master', formatted]).wait()