Morningstar Quantitative Ratings for Stocks are generated using an algorithm that compares companies that are not under analyst coverage to peer companies that do receive analyst-driven ratings.
s = s.replace(' ','').lower()#先把空格替换掉#.replace()括号内第一个的参数是要替换的对象，第二个是用什么替换#s.str.lower(),'→ lower ...
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