只认真的学习着python，比较不出来<<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa> href=" http://biz.fin<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>nce.sin<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>.com.cn/zjzt/more.php?lytype=ipoly_hyxdly&title=%CD%F8%C9%CF%D3%E9%C0%D6%D7%DC%BB%E3%B9%D9%CD%F8XS686%A1%A4COM " t<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>rget="_self">因<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>><<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa> href=" https://www.imooc.com/q<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>det<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>il/16389 " t<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>rget="_self">为<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>><<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa> href=" http://house.chin<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>.com.cn/sousou/%25101%253D%252C%2520%25%43%33%25%45%35%25%42%35%25%45%39%25%42%38%25%41%33%25%43%30%25%46%42%25%43%30%25%42%34%25%42%45%25%43%36%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%43%31%25%43%39%25%44%34%25%42%34%25%43%38%25%43%38%25%43%42%25%44%31_1s.htm " t<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>rget="_self">J<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>><a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa><a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%43%33%25%45%35%25%42%35%25%45%39%25%43%45%25%41%43%25%42%43%25%44%33%25%43%42%25%42%39%25%32%30%25%42%30%25%44%39%25%42%36%25%43%38%25%42%45%25%41%44%25%44%31%25%45%39%25%42%39%25%44%39%25%43%44%25%46%38%25%35%38%25%35%33%25%33%36%25%33%38%25%33%36%25%41%31%25%41%34%25%34%33%25%34%46%25%34%44%252C%25%43%37%25%46%41%25%42%45%25%42%38%25%42%44%25%44%41%25%43%34%25%42%46%25%42%31%25%45%44_1s.htm " target="_self">va><a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>中字符串常量管理有特殊机制，所以不同对象指向同一个常量使用“==”比较结果<<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa> href=" https://www.imooc.com/q<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>det<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>il/16389 " t<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>rget="_self">为<a href=" http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%42%30%25%44%39%25%42%43%25%44%32%25%43%30%25%44%36%25%42%36%25%43%34%25%42%32%25%41%39%25%43%41%25%44%33%25%41%31%25%42%45%25%34%32%25%33%32%25%33%30%25%33%32%25%33%34%25%32%45%25%34%33%25%34%45%25%42%42%25%42%36%25%44%33%25%41%44%25%43%34%25%46%41%25%41%31%25%42%46%252C%25%44%31%25%43%43%25%43%43%25%41%38%25%42%39%25%45%33%25%42%32%25%41%35_1s.htm " target="_self">aa>>true

else是需要和if一起出现的，你没有写if怎么会出现else呢？