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Python code:

import os
import os.path
import re

path = 'e:/download/'
kzm = []
newKzm = []

for root,dirs,files in os.walk(path):
for file in files:
f = (os.path.join(root,file))
if '.' in f and re.search('\w{4}$',f):
var = f[-4:]
kzm.append(var)
elif '.' in f and re.search('\w{3}$',f):
var = f[-3:]
kzm.append(var)
elif '.' in f and re.search('\w{2}$',f):
var = f[-2:]
kzm.append(var)
for i in kzm:
if kzm.count(i) >= 2 and newKzm.count(i) ==0:
newKzm.append(i)
elif kzm.count(i) == 1:
newKzm.append(i)
print(newKzm)

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Python codeimport os

path='e:/download/'
kzm= set()for root,dirs,filesin os.walk(path):for filein files:
ext= os.path.splitext(file)[1]
kzm.add(ext)print kzm

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