def fun(a,b):
    c={}
    for i in a:
        if i in b:
            c[i]=b
    return c
a=[1,2,3]
b=[1,2,3]
print(fun(a,b))

         c[i]=i

 def fun(a,b):
    c = {}
    for i in a:
        if i in b:
            c[i] = i
    return c

 >>> a=[1,2,3]
>>> b=[4,5,6]
>>> dict(zip(a, b))
{1: 4, 2: 5, 3: 6}