python 文件操作复习一

print "当前路径："
        print os.getcwd()
        print "判断是否是一个文件："
        print os.path.isfile(os.getcwd())
        print "是否是一个目录："
        print os.path.isdir(os.getcwd())
        print os.system("ls")
        print "判断是否是绝对路径："
        print os.path.isabs("excp01.py")
        print "检验给出的路径是否真地存:"
        print os.path.exists("/Users/zhouhaijun")
        print "返回一个路径的目录名和文件名"
        print os.path.split("/Users/zhouhaijun")
        print "分离文件名与扩展名"
        print os.path.splitext("tmp1.dat")
        print "找出某个目录下所有的文件，并在每个文件中写入“osTest”"
        for root,dis,files in os.walk("/Users/zhouhaijun/Desktop/hhhhh/osTest"):
            for name in files:
                print name,root,os.path.join(root,name)
                with open(os.path.join(root,name),"w") as fp:
                    fp.write("good! liwen \n 学习walk"
                             "命令")
        print "ok!"

        print "如果某个目录下文件名包含dat后缀名，则把文件后面追加写一行“被我找到了！"
        for root,dirs,files in os.walk("/Users/zhouhaijun/Desktop/hhhhh/osTest"):
            for name in files:
                suffix = os.path.splitext(os.path.join(root,name))[-1]
                if suffix in "dat":
                    print name
                    with open(os.path.join(root,name),"a") as fp:
                        fp.write("\n我找到了！！！")
        print "修改内容："
        os.system("cd /Users/zhouhaijun/Desktop/hhhhh/osTest")
        print "获取当前路径"
        os.chdir("/Users/zhouhaijun/Desktop/hhhhh/osTest")
        print "获取当前目录："
        print os.getcwd()
        for line in fileinput.input("dd",inplace = 1):
            line = line.replace("walk","\n复习fileinput.input命令")
            print line

        print "seek函数："
        with open("dd","r+") as f:
            old = f.read()
            print "内容是：",old
            f.seek(2)
            f.write("liwen is very googd!!!!")