Python 字典 popitem()方法
原文:https://www . geesforgeks . org/python-dictionary-pop item-method/
Python 字典 popitem()方法从字典中移除最后插入的键值对，并将其作为元组返回。
语法关闭.泼皮()
参数:无
从字典中返回:包含任意键值对的元组。那对已从词典中删除。
生成随机数在日常生活中有很多应用。在列表中，支持相同的各种功能。一整个库都专用于 Python 处理随机数。但有时，我们需要用字典执行类似的任务。
注意:如果字典为空，popitem()方法返回 keyError。
Python 字典 popitem()方法示例
示例#1: 演示 popitem()的使用
这里我们将使用 python 字典在最后元素中打开项目。
Python 3
# 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:这个特殊的函数可以在不使用任何随机函数的情况下，用于制定玩游戏的随机名称或决定随机排名。
示例#2: 演示 popitem()的应用
Python 3
# 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 : {}
示例 3: Python 字典 popitem 随机
Python 3
# Python3 code to demonstrate working of
# Get random dictionary pair in dictionary
# Using popitem()
# Initialize dictionary
test_dict = {'Gfg' : 1, 'is' : 2, 'best' : 3}
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
# Get random dictionary pair in dictionary
# Using popitem()
res = test_dict.popitem()
# printing result
print("The random pair is : " + str(res))
输出:
The original dictionary is : {'Gfg': 1, 'best': 3, 'is': 2}
The random pair is : ('is', 2)
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