This blogs explains some of the methods available in Python dictionary
clear()
Remove all key value pairs from dictionary
Syntax
dict.clear()
city = {'UK':'London','U.S.A':'Washingtion','India':'Delhi','China':'Beijin'}
print('Dictionary key value pairs')
print(city)
print('Using clear method to remove all pairs from dictionary')
city.clear()
print(city)
Output
Dictionary key value pairs
{'UK': 'London', 'U.S.A': 'Washingtion', 'India': 'Delhi', 'China': 'Beijin'}
Using clear method to remove all pairs from dictionary
{}get()
Syntax
dict.get(k,r)
Returns value associated with key ‘k’. If no value found, it returns ‘r’
Example
city = {'UK':'London','U.S.A':'Washingtion','India':'Delhi','China':'Beijin'}
print(city.get('UK','Incorrect key'))
print(city.get('France','Incorrect key'))
print(city.get('China','Incorrect key'))
print(city.get('India','Incorrect key'))
print(city.get('Germany','Incorrect key'))
Output
London
Incorrect key
Beijin
Delhi
Incorrect key
items()
Syntax
dict.items()
Returns key value pair for dictionary
Example
city = {'UK':'London','U.S.A':'Washingtion','India':'Delhi','China':'Beijin'}
print(city.items())
Output
dict_items([('UK', 'London'), ('U.S.A', 'Washingtion'), ('India', 'Delhi'), ('China', 'Beijin')])keys()
Syntax
dict.keys()
Returns only keys from the dictionary
Example
city = {'UK':'London','U.S.A':'Washingtion','India':'Delhi','China':'Beijin'}
print(city.keys())
Output
dict_keys(['UK', 'U.S.A', 'India', 'China'])values()
Syntax
dict.values()
Returns only values from dictionary
Example
city = {'UK':'London','U.S.A':'Washingtion','India':'Delhi','China':'Beijin'}
print(city.values())
Output
dict_values(['London', 'Washingtion', 'Delhi', 'Beijin'])update()
Syntax
dict1.update(dict2)
Copies all key-value pairs from dict2 to dict1
Example
city = {'UK':'London','U.S.A':'Washingtion','India':'Delhi','China':'Beijin'}
city2 = {'France':'Paris','Germany':'Berlin','Japan':'Tokyo','Egypt':'Cairo'}
city.update(city2)
print(city)
Output
{'UK': 'London', 'U.S.A': 'Washingtion', 'India': 'Delhi', 'China': 'Beijin', 'France': 'Paris', 'Germany': 'Berlin', 'Japan': 'Tokyo', 'Egypt': 'Cairo'}
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