Contents
  1. 1. 重复项出现的次数
    1. 1.1. eg1
    2. 1.2. eg2
    3. 1.3. eg3
  2. 2. 列表中出现最多的项
    1. 2.1. eg1
    2. 2.2. eg2
    3. 2.3. eg3

对一个列表,比如[1,2,2,2,2,3,3,3,4,4,4,4],现在我要统计这个列表里的重复项,并且重复了几次也要统计出来。

重复项出现的次数

eg1

1
2
3
4
mylist = [1,2,2,2,2,3,3,3,4,4,4,4]
myset = set(mylist) #myset是另外一个列表,里面的内容是mylist里面的无重复项
for item in myset:
print("the %d has found %d" %(item,mylist.count(item)))

eg2

1
2
3
4
5
6
7
List=[1,2,2,2,2,3,3,3,4,4,4,4]
a = {}
for i in List:
if List.count(i)>1:
a[i] = List.count(i)
print (a)
#利用字典的特性来实现

eg3

1
2
3
>>>from collections import Counter
>>>Counter([1,2,2,2,2,3,3,3,4,4,4,4])
>>>Counter({1: 5, 2: 3, 3: 2})

列表中出现最多的项

eg1

1
2
3
4
5
6
7
from collections import Counter
a=['bj', 'bj', 'bj', 'gz', 'shh', 'shh']
d=Counter(a)
print d
print d.most_common()
print d.most_common()[0]
print d.most_common()[0][0]

eg2

1
2
3
4
5
6
7
8
def sortbylistcount(self,list):
cnt=0
city=""
for x in list:
if list.count(x)>cnt:
city=x
cnt=list.count(x)
return city

eg3

1
2
3
4
5
6
for n in a:
old=a.count(n)
num=max(a.count(m) for m in a)
if num==old:
print n
break
Contents
  1. 1. 重复项出现的次数
    1. 1.1. eg1
    2. 1.2. eg2
    3. 1.3. eg3
  2. 2. 列表中出现最多的项
    1. 2.1. eg1
    2. 2.2. eg2
    3. 2.3. eg3