# Find the frequency of each element in an list in python

Python program for Find the frequency of each element in an list. Here problem description and other solutions.

``````class Occurrence :
#  Function which is display array elements
def display(self, arr) :
i = 0
while (i < len(arr)) :
print( arr[i], end = "   ")
i += 1

print(end = "\n")

#  Count occurrence of given list
def frequency(self, arr) :
#  Display given list
self.display(arr)
#  Create a empty map
map = dict()
i = 0
while (i < len(arr)) :
if ((arr[i] in map.keys())) :
#  When key exists then update value
map[arr[i]] = map.get(arr[i]) + 1
else :
map[arr[i]] = 1

i += 1

print("  Occurrence ")
for key, value in map.items() :
print("  ", key ," : ", value)

def main() :
#  Array element
arr = [1, 3, 2, 1, 4, 2, 7, 9, 1, 3, 3, 4, 7]

if __name__ == "__main__": main()``````

Output

``````1   3   2   1   4   2   7   9   1   3   3   4   7
Occurrence
1  :  3
2  :  2
3  :  3
4  :  2
7  :  2
9  :  1``````

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