找出s=”aabbccddxxxxffff”中，出现次数最多的字母。

题目22：

（1）找出s=”aabbccddxxxxffff”中，出现次数最多的字母

#encoding=utf-8
s="aabbccddxxxxffff"
max_occurence_times_letters = []
max_occurence_times=0
for i in s:if s.count(i) > max_occurence_times:max_occurence_times_letters = []max_occurence_times_letters.append(i)max_occurence_times = s.count(i)elif  s.count(i) == max_occurence_times:max_occurence_times_letters.append(i)
print(list(set(max_occurence_times_letters)))

（2）如何找出字典中的value.

方法1：

#encoding=utf-8
d={'a':1,"b":2,"c":3,"d":4,"e":4}
max_value=d['a']
result=[]
for k,v  in d.items():print(k,v)if v >max_value:max_value = vresult=[]result.append(k)elif v== max_value:result.append(k)
print(result)

方法2：

#encoding=utf-8
d={'a':1,"b":2,"c":3,"d":4,"e":4}
max_value=max(d.values())
result=[]
for k,v  in d.items():if v== max_value:result.append(k)
print(result)

#encoding=utf-8
def count_occurence(s,letter):if isinstance(s,str) or not instance(letter,str):return 0times=0if letter not in s:return 0else:for i in s:if i== letter:times+=1return times
print(count_occurence("aaa","a"))
print(count_occurence("aaa","b"))
print(count_occurence("aaa",2))

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