初学python，出现错误，但是不知道如何修改

错误提示是
Traceback:
in
in openOrSenior
AttributeError: 'list' object attribute 'append' is read-only

def openOrSenior(data):
    # Hmmm.. Where to start?
    long=len(data)
    result=[]
    for i in range(long):
        if (data[i][0]>=55) and (data[i][1]>7):
            result.append=("Senior")
        else:
            result.append=("Open")
          
    return result