实现往文件1.txt中增加20行数据，每一行存放一个10-100之间的随机整数

def file_write(self):
    import random   #模块
    with open('1.txt','w',encoding='utf8') as f:   #存入文件
        for i in range(20):
            num = random.randint(10,100)
            f.write(str(num)+'\n')

f9 = MyCar(a,b) f9.file_write()