Python – Insertion at the beginning in OrderedDict
Given an ordered dict, write a programm to insert items in beginning of ordered dict.
Examples –
Input:
original_dict = {'a':1, 'b':2}
item to be inserted ('c', 3)
Output: {'c':3, 'a':1, 'b':2}
Input:
original_dict = {'akshat':1, 'manjeet':2}
item to be inserted ('nikhil', 3)
Output: {'nikhil':3, 'akshat':1, 'manjeet':2}
Below are various methods to insert items in starting of ordered dict.
Method #1: Using OrderedDict.move_to_end()
# Python code to demonstrate # insertion of items in beginning of ordered dict from collections import OrderedDict # initialising ordered_dict iniordered_dict = OrderedDict([('akshat', '1'), ('nikhil', '2')]) # inserting items in starting of dict iniordered_dict.update({'manjeet':'3'}) iniordered_dict.move_to_end('manjeet', last = False) # print result print ("Resultant Dictionary : "+str(iniordered_dict)) |
chevron_right
filter_none
Output:
Resultant Dictionary : OrderedDict([(‘manjeet’, ‘3’), (‘akshat’, ‘1’), (‘nikhil’, ‘2’)])
Method #2: Using Naive Approach
This method only works in case of unique keys
# Python code to demonstrate # insertion of items in beginning of ordered dict from collections import OrderedDict # initialising ordered_dict ini_dict1 = OrderedDict([('akshat', '1'), ('nikhil', '2')]) ini_dict2 = OrderedDict([("manjeet", '4'), ("akash", '4')]) # adding in beginning of dict both = OrderedDict(list(ini_dict2.items()) + list(ini_dict1.items())) # print result print ("Resultant Dictionary :"+str(both)) |
chevron_right
filter_none
Output:
Resultant Dictionary :OrderedDict([(‘manjeet’, ‘4’), (‘akash’, ‘4’), (‘akshat’, ‘1’), (‘nikhil’, ‘2’)])
Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.
