It looks like you're just overthinking the problem. Think about what actual outcome you want to have. This code is so confused that I'm not even sure what the actual problem is you're trying to solve. I see one of two possibilities (that seem reasonable - there are infinite unreasonable ones):
You want to assign x = '2,3,4' and y = '5,5,6', but you don't have the values at the time you initialize x and y. In this case, you'd do:
data = []
... data is eventually populated ...
x, y = data
You want a dictionary with keys x and y with the corresponding values from data, in which case you'd do:
klist = ['x', 'y']
data = ['2,3,4', '5,5,6']
mydict = dict(zip(klist, data))
# mydict['x'] == '2,3,4'
