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Python Sort Dictionary by Key or Value

Python3 Examples

Given a dictionary, sort it by key or value.

Example 1: Sort by Key

def dictionairy():  

    # Declare dictionary
    key_value ={}     

    # Initialize
    key_value[2] = 56       
    key_value[1] = 2 
    key_value[5] = 12 
    key_value[4] = 24
    key_value[6] = 18      
    key_value[3] = 323 

    print ("Sort by Key:")   

    # sorted(key_value) returns a sorted list of keys
    # Dictionary sorted by key
    for i in sorted (key_value) : 
        print ((i, key_value[i]), end =" ") 

def main(): 
    # Call function
    dictionairy()              

# Main function
if __name__=="__main__":      
    main()

Executing the above code outputs:

Sort by Key:
(1, 2) (2, 56) (3, 323) (4, 24) (5, 12) (6, 18)

Example 2: Sort by Value

def dictionairy():  

    # Declare dictionary
    key_value ={}     

    # Initialize
    key_value[2] = 56       
    key_value[1] = 2 
    key_value[5] = 12 
    key_value[4] = 24
    key_value[6] = 18      
    key_value[3] = 323 


    print ("Sort by Value:")   
    print(sorted(key_value.items(), key = lambda kv:(kv[1], kv[0])))     

def main(): 
    dictionairy()             

if __name__=="__main__":       
    main()

Executing the above code outputs:

Sort by Value:
[(1, 2), (5, 12), (6, 18), (4, 24), (2, 56), (3, 323)]

Example 3: Sort List of Dictionaries

lis = [{ "name" : "Taobao", "age" : 100},  
{ "name" : "tutorialpro", "age" : 7 }, 
{ "name" : "Google", "age" : 100 }, 
{ "name" : "Wiki" , "age" : 200 }] 

# Sort by age in ascending order
print ("List sorted by age in ascending order: ")
print (sorted(lis, key = lambda i: i['age']) )

print ("\r") 

# Sort by age first, then by name
print ("List sorted by age and name: ")
print (sorted(lis, key = lambda i: (i['age'], i['name'])) )

print ("\r") 

# Sort by age in descending order
print ("List sorted by age in descending order: ")
print (sorted(lis, key = lambda i: i['age'],reverse=True) )

Executing the above code outputs:

List sorted by age in ascending order: 
[{'name': 'tutorialpro', 'age': 7}, {'name': 'Taobao', 'age': 100}, {'name': 'Google', 'age': 100}, {'name': 'Wiki', 'age': 200}]

List sorted by age and name: 
[{'name': 'tutorialpro', 'age': 7}, {'name': 'Google', 'age': 100}, {'name': 'Taobao', 'age': 100}, {'name': 'Wiki', 'age': 200}]

List sorted by age in descending order: 
[{'name': 'Wiki', 'age': 200}, {'name': 'Taobao', 'age': 100}, {'name': 'Google', 'age': 100}, {'name': 'tutorialpro', 'age': 7}]

[{'name': 'Wiki', 'age': 200}, {'name': 'Taobao', 'age': 100}, {'name': 'Google', 'age': 100}, {'name': 'tutorialpro', 'age': 7}]

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