for deviceInDic in devicesDic:
RuntimeError: dictionary changed size during iteration

devicesDic = {'duck_waxer' : 0}
x = int(0)
#y = x
y = True
while y == True:
    try:
        jdata = data["result"]["items"][0]["tagValues"]["IdDevicesMap"]["value"]
        for device in jdata.values():
            for deviceInDic in devicesDic:
                if deviceInDic == device:
                    devicesDic[device] += 1
                else:
                    print 'else'
                    devicesDic[device] = 1

    except KeyError:
        #noValues += 1
        pass

    except IndexError:
        break
    print devicesDic
    y = False