def getIsIdentityTetragridOrNone(tetragrid):
 if (tetragrid == None):
  return True
 return getIsIdentityTetragrid(tetragrid)

def getIsIdentityTetragridOrNone ( tetragrid ) : if ( tetragrid == None ) : return True return getIsIdentityTetragrid ( tetragrid )
determine if the tetragrid is none or if it is the identity tetragrid .