Tutorial #21 || Python Dictionaries || Python Data Structures || Python Tutorials for Beginners
Tutorial #20 || Tuples in Python || Python Data Structures || Python Tutorials for Beginners video Link: • Tutorial #20 || Tuples in Python || Python...
Tasks:
1) Take three dictionaries and concatenate all three into one new dictionary
2) A dictionary contains students data( keys → S.No, values → list of name , age ). Now add a new student data and delete one old student data. Print result in the format of “S.No : [ name , age ] “
3) Update your contacts in contact application.
Sample Dictionary: dict1 = { ' k1 ' : 200, ' k2 ' : 300, ' k3 ' : 400 }
Dictionary Methods :
Description copy( ) Returns the copy of dictionary
Example: dict2 = dict1.copy( ) Result: dict2 = { ' k1 ' : 200, ' k2 ' : 300, ' k3 ' : 400 }
fromkeys( ) Returns specified keys and values
Example: x = (‘key1’ , ‘key2’) y = 0 newDict = dict.fromkeys(x, y) Result: newDict = [ ‘key1’ : 0, ‘key2’ = 0 ]
get( ) Gets the value using particular key.
Example: dict1.get( ‘ k1 ’ ) Result: 200
items( ) Returns the list containing tuple for each pair of key and value
Example: dict1.items( ) Result: dict_items ([('k1', 200), ('k2', 300), ('k3', 400)])
keys( ) Similar to get( ) method.
Example: dict1.keys( ) Result: dict_keys(['k1', 'k2', 'k3'])
values( ) Returns the list containing tuple for each pair of key and value
Example: dict1.items( ) Result: dict_items ([('k1', 200), ('k2', 300), ('k3', 400)])
pop( ) Removes the value using specified key
Example: dict1.pop( ‘ k1 ‘ )
popitem( ) Removes the key and value at the end of the dictionary
Example: dict1.popitem( ) Result: dict1 = { ' k1 ' : 200, ' k2 ' : 300 }
setdefault( ) If key does not exist, this method insert key. Returns the value of particular key
update( ) Updates the values of specified key
Example: dict1.update({'color' : 'green'}) Result: dict1 = {'k1': 200, 'k2': 300, 'k3': 400, 'color': 'green'}
clear( ) Removes all items in the dictionary
Example: dict1.clear( ) Result: { }
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