countries = {
'np': 'Nepal',
'ch': 'China',
'us': 'USA'
}
countries['np']
countries.get('np')

countries.setdefault('ch', 'hongkong') #hk vetyo vane vh ko value return garxa, if xaina vane key value duitai thapidinxa

countries['pp'] #error falxa
countries.get('pp') #null return garxa. Recall index and find
countries.get('pp', 'palestine') # null xa vane palestine return garxa

for i in countries:
	print(i) #keys haru matra return garxa

 countries.pop('us', 'Hahaha') #us xa vane pop hunxa, xaina vane Hahaha return garxa
countries.popitem() #arbitery item pop garxa