python - How to find the count of a word in a string? -

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i have string "hello going hello am". want find how many times word occur in string. example hello occurs 2 time. tried approach prints characters - 

def countword(input_string):     d = {}     word in input_string:         try:             d[word] += 1         except:             d[word] = 1      k in d.keys():         print "%s: %d" % (k, d[k]) print countword("hello going hello am")

i want learn how find word count.

if want find count of individual word, use count:

input_string.count("hello")

use collections.counter , split() tally words:

from collections import counter  words = input_string.split() wordcount = counter(words)

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