摘要：判断是否有ox sample： def xo(s): s = str.lower(s) s = list(s) counto=0 countx=0 for item in s: if item == 'o': counto+=1 elif item =='x': countx+=1 return c 阅读全文

摘要：sudo pip install virtualenv virtualenv -p /usr/bin/python3 py3env source py3env/bin/activate python --version 阅读全文