TypeError :(＆＃34;不支持的操作数类型用于＆amp ;:＆＃39; str＆＃39;和＆＃39; int＆＃39;＆＃34;，u＆＃39;发生在索引48＆＃39; ）数据

Question

我有一个数据框，我想创建一个函数，以便从其他2列创建一个列

def day(data=data):
    if data['week_day'] == 'Saturday':
        return 6
    if data['week_day'] == 'Monday':
        return 1
    if data['week_day'] == 'Tuesday':
        return 2
    if data['week_day'] == 'Wednesday':
        return 3
    if data['week_day'] == 'Thursday':
        return 4
    if data['week_day'] == 'Friday':
        return 5
    if data['week_day'] == 'Sunday' & data['Month'] == 7:
        return 7
    if data['week_day'] == 'Sunday' & data['Month'] == 12:
        return 8
    else:
        return 0

    data['week_daye']= data.apply(day,axis=1)

但它得到了这个错误我该怎么解决呢