python3中格式化输出时报错unsupported format string passed to bytes.__format__

示例代码：

myRatings = np.mat(np.zeros((nm,1)))

myRatings[0] = 4
myRatings[97] = 2
myRatings[6] = 3
myRatings[11] = 5
myRatings[53] = 4
myRatings[63] = 5
myRatings[65] = 3
myRatings[68] = 5
myRatings[182] = 4
myRatings[225] = 5
myRatings[354] = 5

print(u'我的评分:')
for i in range(nm):
    if myRatings[i] > 0:
        print('{:<50} {}'.format( movieList[i].decode('utf-8'), myRatings[i].A[0,0]))

解释：从python2中移植代码到python3中的时候，格式化输出的过程中会报错unsupported format string passed to bytes.__format__是因为python3中字节类和字符串类的不能同一个格式化输出，所以需要对字符串解码（红色字体）。