宏变量赋值带有空格，逗号和引号怎么办？谢谢！

shiyiming

%macro deleteRow (week =, key =);
    data X_&week;
        set Y_&week;
        where substr(columnName,1,2) in (&key);
    run;
%mend;

%macro iteration();
     %do weekly = &startWeek %to &endWeek;
        %deleteRow (week = &weekly, key = &keyWords);
    %end;
%mend;

%let startWeek = 10;
%let endWeek = 11;
%let keyWords = [b:rejsopl2]'PP', 'PM' 'PN'[/b:rejsopl2];

%iteration()

现在我遇到的问题是[b:rejsopl2]'PP', 'PM' 'PN'[/b:rejsopl2]无法赋值到key里面的，我想请问宏变量赋值带有空格，逗号和引号怎么办？谢谢！

Qiong

%let keyWords =%str('PP', 'PM' 'PN');