摘要:
2019-11-21Python3-setdefaultPython 1. 要求统计一段话中字母出现的次数 1-1. 错误代码1message='there is no more thing; should be quit'count={} for character in message: count[character]=count[character]+1print(count)报错如... 阅读全文
摘要:
2019-11-21sql疑惑sql疑惑 1. between用法的疑惑sqlzoo中4. Which country has a population that is more than Canada but less than Poland? Show the name and the population.刚开始想用between做代码如下SELECT name,population F... 阅读全文