Python dict popitem()用法及代码示例

产生随机数在日常生活中有许多应用。在列表中，支持相同的各种函数。整个库专用于Python处理随机数。但是有时候，我们需要对字典执行类似的任务。

字典中的popitem()方法有助于实现类似的目的。它从字典中删除任意键/值对，并将其作为元组返回。

用法：dict.popitem()

参数： None

返回： A tuple containing the arbitrary key-value pair from dictionary. That pair is removed from dictionary.

代码1：演示popitem()的使用

# Python 3 code to demonstrate 
# working of popitem() 
  
# initializing dictionary  
test_dict = { "Nikhil" :7, "Akshat" :1, "Akash" :2 } 
  
# Printing initial dict 
print ("The dictionary before deletion:" + str(test_dict)) 
  
# using popitem() to return + remove arbitrary  
# pair 
res = test_dict.popitem() 
  
# Printing the pair returned 
print ('The arbitrary pair returned is:' + str(res)) 
  
# Printing dict after deletion 
print ("The dictionary after removal:" + str(test_dict))

输出：

The dictionary before deletion:{'Nikhil':7, 'Akshat':1, 'Akash':2}
The arbitrary pair returned is:('Akash', 2)
The dictionary after removal:{'Nikhil':7, 'Akshat':1}

实际应用：此特定函数可用于制定玩游戏的随机名称或确定随机排名列表，而无需使用任何随机函数。

代码2：演示popitem()的应用

# Python 3 code to demonstrate 
# application of popitem() 
  
# initializing dictionary  
test_dict = { "Nikhil" :7, "Akshat" :1, "Akash" :2 } 
  
# Printing initial dict 
print ("The dictionary before deletion:" + str(test_dict)) 
  
n = len(test_dict) 
  
# using popitem to assign ranks 
for i in range(0, n):
    print ("Rank " + str(i + 1) + " " + str(test_dict.popitem())) 
  
# Printing end dict 
print ("The dictionary after deletion:" + str(test_dict))

输出：

The dictionary before deletion:{'Nikhil':7, 'Akshat':1, 'Akash':2}
Rank 1 ('Akash', 2)
Rank 2 ('Akshat', 1)
Rank 3 ('Nikhil', 7)
The dictionary after deletion:{}

相关用法

注：本文由纯净天空筛选整理自manjeet_04大神的英文原创作品 Python Dictionary | popitem() method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。