Calculating the scrabble value of a word

def scrabble_value(word):

if len(word)==1:
       return 0
       val=dict(a=1,b=3,c=3,d=2,e=1,f=4,g=2,h=4,i=1,j=8,k=5,l=1,m=3,n=1,o=1,p  =3,q=10,r=1,s=1,t=1,u=1,v=4,w=4,x=8,y=4,z=10) 

return reduce(lambda x,y:x+y,map(lambda x:val[x],word))