练习五十五：文件操作

有两个磁盘文件A和B，各存放一行字母，要求把这两个文件中信息合并（按字母顺序排列），输出到一个新文件C中。

一般方法(由于python是顺序，with 可以不缩进)：

with open(r'C:UsersPINPIN	estfile1.txt','r+') as f1:
    t1 = str(f1.readlines()[0])
    print(t1)
    with open(r'C:UsersPINPIN	estfile2.txt','r+') as f2:
        t2 = str(f2.readlines()[0])
        print(t2)
        with open(r'C:UsersPINPIN	estfile3.txt','w+') as f3:
            t3 = t1 + t2
            print(t3)
            f3.write(t3)

执行结果：

12345
abcdefg
12345abcdefg

函数方法：

def test(t1,t2):
    with open(t1,'r+') as f1:
        t1 = str(f1.readlines()[0])
    with open(t2,'r+') as f2:
        t2 = str(f2.readlines()[0])  
    with open(r'C:UsersPINPIN	estfile3.txt','w+') as f3:
        t3 = t1 + t2
        f3.write(t3)
        return(t3)
t1 = r'C:UsersPINPIN	estfile1.txt'
t2 = r'C:UsersPINPIN	estfile2.txt'
print(test(t1,t2))

执行结果：

12345abcdefg