More newbie help required with dictionaries

[loial]

The following code only returns the last row(222222) added to the
machines dictionary.
presumably I need some additional syntax to add rows to the dictionary
rather than overwrite.

What do I need to add?

machinekey = "111111"

machines = { machinekey:[1,0,0,0,0,0,0,0,0,0,0,0,0] }

machinekey = "222222"

machines = { machinekey:[0,1,0,0,0,0,0,0,0,0,0,0,0] }

for machine in machines.keys():
           print machine