dict7.py

#update() - combining - merging both dictionaries and updating first - dictionary
first={'name':'karthi',
   'age':7,
   'city':'chennai',
    }

second={'name':'sarvesh',
'age':3}  

#update () function won't return any value.
print(first.update(second))
#Output: None

print(first)
#Output:{'name': 'sarvesh', 'age': 3, 'city': 'chennai'}