signalDict = {1: { sig1: 8, sig2 : 7, sig3 : 6, sig4 : 8}, 2: {sig1: 5, sig2 : 5, sig3 : 5, sig4 : 5}...  }

backendSignalDict = {
            'signal1': signal1Function,
            'signal2': signal2Function,
            'signal3': signal3Function
        }

def signal1Function():
       val = signalDict[sig1] + signalDict[sig2]
       return val
def signal2Function():
       val = signalDict[sig3] + signalDict[sig4]
       return val
.....


def applyFunction():
try:
    for signal in signalList:
          newVal = backendSignalDict[signal](signalDict)
          return newVal