英文字符频率统计。编写一个程序,对给定字符串中出现的a~z字母频率进行分析,忽略大小写,采用降序方式输出。相关知识点: 试题来源: 解析 txt = "i love three things,the sun for morning,the moon for night,and you for ever."txt = txt.lower()counts = dict()for i in txt: counts[i] = counts....