print letters[1:4],运行报错name 'letters' is not defined
新手在学python, 用的python2.7 ,按照书上输了这行,就报错了,求大神指点
哆啦炼金术师
9 years, 4 months ago
新手在学python, 用的python2.7 ,按照书上输了这行,就报错了,求大神指点