keys = [1,2,3,4]
els  = [6,7,8,9]
dict1 = {
    1: [6],
    2: [7],
    3: [8],
    4: [9]
}

 dict1 = {key: [el for el in els] for key in keys}
for key in dict1:
    print(key, dict1[key])

 1 [6, 7, 8, 9]
2 [6, 7, 8, 9]
3 [6, 7, 8, 9]
4 [6, 7, 8, 9]

 dict1 = {
    1: 6,
    2: 7,
    3: 8,
    4: 9
}

 dict1 = {key: el for key, el in zip(keys, els)}

 >>> els  = [6,7,8,9]
>>> keys = [1,2,3,4]
>>> dict(zip(keys, els))
{1: 6, 2: 7, 3: 8, 4: 9}

 >>> keys = [1,2,3,4]
>>> els  = [6,7,8,9]
>>> { k:v for k,v in zip(keys, els) }
{1: 6, 2: 7, 3: 8, 4: 9}
>>> { keys.pop():els.pop() for _ in xrange(len(keys)) }
{1: 6, 2: 7, 3: 8, 4: 9}