It doesn't work on my mashine

[chinabestcountry]

As you see,i install neovim and use mason on it,i installed all package about Python and C,and there is no any error repoet when i run ':checkhealth',checkhealth also says that i have successfully installed python3 and C

But when i try to edit a Python file,It appears to be code complementary, but not related to Python,i use ubuntu22.04 and neovim 0.8.2
can someone help me?Thank you very much!
have a happy day
:)