python_文件的赋值

import osdef Copy_file(pathSrc,pathDest):    with open(pathSrc,'r',encoding='utf-8')as PS,open(pathDest,'w',encoding='utf-8') as PD:        for line in PS:            PD.write(line)    print("复制成功")def fileName(pathSrc,pathDest):    if os.path.exists(pathDest):        copy_pathDest = pathDest.rsplit('.',1)        copy_pathDest=copy_pathDest[0]+"副本."+copy_pathDest[1]        Copy_file(pathSrc,copy_pathDest)    else:        Copy_file(pathSrc, pathDest)pathSrc = input('输入源文件：')pathDest = input('输入目标文件：')fileName(pathSrc,pathDest)