数一段字母中各个字母的个数
在这里插入代码片
``` insulin = "i have a dream"for amino_acid in "abcdefghigklmnopqrstuvwxyz":number = insulin.count(amino_acid)print(amino_acid,number)
数一段字母中各个字母的个数
在这里插入代码片
``` insulin = "i have a dream"for amino_acid in "abcdefghigklmnopqrstuvwxyz":number = insulin.count(amino_acid)print(amino_acid,number)