这里以在windows下搜索并启动QQ为例，我先把开始菜单、桌面和快速启动栏找了一遍，这样能缩短查找时间。如果找不到再到每个分区中查找。 

    import os        disk=['D','E','F','G','H']        def search_file(filename,search_path,pathsep=os.pathsep):            for path in search_path.split(pathsep):                candidate = os.path.join(path,filename)                if os.path.isfile(candidate):                    return os.path.abspath(candidate)        if __name__=='__main__':            found=False            for i in os.walk('C:\ProgramData\Microsoft\Windows\Start Menu\Programs'):                search_path=i[0]                find_file=search_file('腾讯QQ.lnk',search_path)                if find_file:                    os.startfile(find_file)                    found=True            if not found:                for i in os.walk('C:\Users\Jack\Desktop'):                    search_path=i[0]                    find_file=search_file('QQ.exe.lnk',search_path)                    if find_file:                        os.startfile(find_file)                        found=True            if not found:                for i in os.walk('C:\Users\Jack\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch'):                    search_path=i[0]                    find_file=search_file('腾讯QQ.lnk',search_path)                    if find_file:                        os.startfile(find_file)                        found=True            if not found:                for i in range(0,5):                    for j in os.walk(disk[i]+':/'):                        search_path=j[0]                        find_file=search_file('QQProtect.exe',search_path)                        if find_file:                            os.startfile(find_file)                            found=True            if not found:                for i in os.walk('C:/Program Files/QQ'):                    search_path=i[0]                    find_file=search_file('QQProtect.exe',search_path)                    if find_file:                        os.startfile(find_file)                        found=True            if not found:                print"无法找到QQ"