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)Show only letters and numbersdef onlycharnum (s,oth= "): S2 = S.lower (); Fomart = ' abcdefghijklmnopqrstuvwxyz0123456789 ' for C in S2:if not C in fomart:s = S.replace (c, ' ');return s; Print (Onlystr ("a000 aa-b"))Intercept stringstr = ' 0123456789′print Str[0:3] #截取第一位到第三位的字符print str[:] #截取字符串的全部字符print str[6:] #截取第七个字符到结尾print str[:-3] # Intercept from the beginning to the third character before print str[2] #截取第三个字符print str[-1] #截取倒数第一个字符print str[::-1] #创造一个与原字符串顺序相反的字符串print str[-3:-1

Days to migrate the Windows project to Linux, and then log on to the user table can not find the error message.Check that the name of the table in the discovery database is M_user, and then remembered that it was a case.Find the cause of the problem and the solution is as follows:Modify the/ETC/MY.CNF, add a line under [Mysqld], and then restart the MySQL database.Service MySQL StopService MySQL Start# set MySQL table name is

-> that needs to be modified right-click① Stop the Tomcat server within Eclipse (stop)② Delete the items deployed in the container (add and remove)③ clearing the container for data (clean)④ opening the Tomcat's modify interface (open)⑤ Find servers location, select second (User tomcat installation)⑥ Modifying the Deploy path to WebApps⑦ Save CloseIt is important to note that the ①②③ must be manipulated, otherwise the following steps will be grayed out

site is purely fun, two months ago spent 3 dollars to register the network domain name, it is easy to do the site. Reporters said that the site borrowed Baidu, the United States sheep and sheep and other well-known sites and animated image will be suspected of infringement? Mr. Tian claimed to have got the cartoon "Pleasant Goat and grey wolf" the production of the authorization, while the use of Baidu logo is in the "free to Baidu propaganda, they will not be happy?" ”"We have never formally a