python:create file

    #os.mkdir(path)
    filename = '1.py'
    try:
        if not os.path.exists("Common"):
            os.mkdir("Common")
        else:
            if os.path.exists("Common/"+filename):
                print(filename)
                with io.open("Common/" + filename, 'r', encoding='utf8') as f:
                    text = f.read()
                    print(text)
            else:
                os.chdir("Common/")
                with io.open(filename, 'w', encoding='utf8') as f:
                    f.write('涂聚文')
                with io.open("Common/" + filename, 'r', encoding='utf8') as f:
                    text = f.read()
                    print(text)
    except FileNotFoundError:
        print('文件不存在')
    except PermissionError:
        print('权限错误')