使用 df.loc 为 dataframe 单元分配新值

Question

Can someone please tell me what the right syntax would be to do the following:

dfpollution3.loc(max(dfpollution3.index),'newhospinextday') = 10

I get the following error:

    dfpollution3.loc(max(dfpollution3.index),'newhospinextday') = 10
    ^
SyntaxError: cannot assign to function call

Answer 1

This is an illegal operation that you are trying to use, refer to the link below SyntaxError: "can't assign to function call"

Answer 2

The issue is that you are using the incorrect brackets, and you should use at not loc in this case.

dfpollution3.at[max(dfpollution3.index),'newhospinextday'] = 10

Indexing is done with square brackets [], and function calls are with parentheses ().