How to sort dictionary in python-Python Tutorial-php.cn

How to sort dictionary in python

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Release： 2019-06-17 13:21:13

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How to sort dictionary in python

In python, dictionaries store data in key-value pairs. Then to sort a dictionary, you can sort it by the key (key) of the dictionary, or you can sort it by the value (value) of the dictionary.

For example

Sort by key

def dictionairy():  
  
    # 声明字典
    key_value ={}     
 
    # 初始化
    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 ("按键(key)排序:")   
 
    # sorted(key_value) 返回一个迭代器
    # 字典按键排序
    for i in sorted (key_value) : 
        print ((i, key_value[i]), end =" ") 
  
def main(): 
    # 调用函数
    dictionairy()              
      
# 主函数
if __name__=="__main__":      
    main()

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The output result of executing the above code is:

按键(key)排序:
(1, 2) (2, 56) (3, 323) (4, 24) (5, 12) (6, 18)

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By dictionary Sort by value

def dictionairy():  
 
    # 声明字典
    key_value ={}     
 
    # 初始化
    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 ("按值(value)排序:")   
    print(sorted(key_value.items(), key = lambda kv:(kv[1], kv[0])))     
   
def main(): 
    dictionairy()             
      
if __name__=="__main__":       
    main()

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The output result of executing the above code is:

按值(value)排序:
[(1, 2), (5, 12), (6, 18), (4, 24), (2, 56), (3, 323)]

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