Python sort dictionary by key or value
Python3 ExamplesGiven 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 re-sorted list
# Sort dictionary by key
for i in sorted (key_value) :
print ((i, key_value[i]), end =" ")
def main():
# Call the function
dictionairy()
# Main function
if __name__=="__main__":
main()
Executing the above code outputs the following result:
按键(key)排序: (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 the following result:
按值(value)排序: [(1, 2), (5, 12), (6, 18), (4, 24), (2, 56), (3, 323)]
Example 3: Sort a list of dictionaries
lis = [{ "name" : "Taobao", "age" : 100},
{ "name" : "Example", "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 the following result:
列表通过 age 升序排序:
[{'name': 'Example', 'age': 7}, {'name': 'Taobao', 'age': 100}, {'name': 'Google', 'age': 100}, {'name': 'Wiki', 'age': 200}]
列表通过 age 和 name 排序:
[{'name': 'Example', 'age': 7}, {'name': 'Google', 'age': 100}, {'name': 'Taobao', 'age': 100}, {'name': 'Wiki', 'age': 200}]
列表通过 age 降序排序:
[{'name': 'Wiki', 'age': 200}, {'name': 'Taobao', 'age': 100}, {'name': 'Google', 'age': 100}, {'name': 'Example', 'age': 7}]
Other extensions