.';;;;;. .,;,. OS: Deepin 20.8 apricot
.,;;;;;;;. ';;;;;;;. Kernel: x86_64 Linux 5.18.17-amd64-desktop-community-hwe
.;::::::::' .,::;;,''''',. Uptime: 1m
,'.:::::::: .;;'. '; Packages: 1759
;' 'cccccc, ,' :: '.. .: Shell: zsh 5.7.1
,, :ccccc. ;: .c, '' :. ,; Resolution: 1875x1057
.l. cllll' ., .lc :; .l' l. DE: Deepin 20.8
.c :lllc ;cl: .l' .ll. :' WM: KWin
.l 'looc. . ,o: 'oo' c, GTK Theme: deepin-dark [GTK2/3]
.o. .:ool::coc' .ooo' o. Icon Theme: bloom
:: ..... .;dddo ;c CPU: Intel Core i7-4870HQ @ 2.494GHz

The default value of deepin20.8 is python3.7, you should use python3 instead of python.

python2.7 is already the latest version of python2.

Try python3 -V