[python]文件读取基本操作

class S:

def a(self):
    fp = open(r'C:\Users\老头\Desktop\a.txt')
    a = fp.read()
    fp.close()
    fp= open(r'C:\Users\老头\Desktop\b.txt')
    b = fp.read()
    fp.close()
    s=int(a)+int(b)
    l=list(a+b)
    l.sort()
    fp = open('C:/Users/老头/Desktop/test3.txt','w',encoding="utf8")
    m=''
    m=m.join(l)
    fp.write(m)
    fp.close()
    fp=open(r'C:\Users\老头\Desktop\test3.txt')
    jieguo=fp.read()


    return jieguo,type(l)

if __name__=='__main__':

s= S
print(s().a())