Python Lists - Finding Number Of Times A String Occurs

How would I find how many times each string appears in my list? Say I have the word: 'General Store' that is in my list like 20 times. How would I find out that it appears 20 time

Solution 1:

While the other answers (using list.count) do work, they can be prohibitively slow on large lists.

Consider using collections.Counter, as describe in http://docs.python.org/library/collections.html

Example:

>>># Tally occurrences of words in a list>>>cnt = Counter()>>>for word in ['red', 'blue', 'red', 'green', 'blue', 'blue']:...    cnt[word] += 1>>>cnt
Counter({'blue': 3, 'red': 2, 'green': 1})

Solution 2:

just a simple example:

   >>> lis=["General Store","General Store","General Store","Mall","Mall","Mall","Mall","Mall","Mall","Ice Cream Van","Ice Cream Van"]
   >>> for x inset(lis):
        print"{0}\n{1}".format(x,lis.count(x))


    Mall
    6
    Ice Cream Van
    2
    General Store
    3

Solution 3:

First use set() to get all unique elements of the list. Then loop over the set to count elements from the list

unique=set(votes)
for item inunique:
    print item
    print votes.count(item)

Solution 4:

I like one-line solutions to problems like this:

deftally_votes(l):
  returnmap(lambda x: (x, len(filter(lambda y: y==x, l))), set(l))

Solution 5:

You can use a dictionary, you might want to consider just using a dictionary from the beginning instead of a list but here is a simple setup.

#list
mylist = ['General Store','Mall','Ice Cream Van','General Store']

#takes values from list and create a dictionary with the list value as a key and#the number of times it is repeated as their valuesdefvotes(mylist):
d = dict()
for value in mylist:
    if value notin d:
        d[value] = 1else:
        d[value] +=1return d

#prints the keys and their vaulesdefprint_votes(dic):
    for c in dic:
        print c +' - voted', dic[c], 'times'#function call
print_votes(votes(mylist))

It outputs:

Mall - voted 1 times
Ice Cream Van - voted 1 times
General Store - voted 2 times