Python–按顺序在开头插入
原文:https://www . geeksforgeeks . org/python-插入-在开始时插入-按顺序排列/T0/
给定一个有序字典,编写一个程序在有序字典的开头插入条目。 示例–
Input:
original_dict = {'a':1, 'b':2}
item to be inserted ('c', 3)
Output: {'c':3, 'a':1, 'b':2}
Input:
original_dict = {'akshat':1, 'manjeet':2}
item to be inserted ('nikhil', 3)
Output: {'nikhil':3, 'akshat':1, 'manjeet':2}
以下是在有序字典的开始插入条目的各种方法。 方法#1:使用 ordereddict . move _ to _ end()
Python 3
# Python code to demonstrate
# insertion of items in beginning of ordered dict
from collections import OrderedDict
# initialising ordered_dict
iniordered_dict = OrderedDict([('akshat', '1'), ('nikhil', '2')])
# inserting items in starting of dict
iniordered_dict.update({'manjeet':'3'})
iniordered_dict.move_to_end('manjeet', last = False)
# print result
print ("Resultant Dictionary : "+str(iniordered_dict))
输出:
结果字典:ordereddct([(' manjeet ',' 3 '),(' akshat ',' 1 ',(' nikhil ',' 2')])
方法 2:使用天真方法 该方法仅在唯一键 的情况下有效
Python 3
# Python code to demonstrate
# insertion of items in beginning of ordered dict
from collections import OrderedDict
# initialising ordered_dict
ini_dict1 = OrderedDict([('akshat', '1'), ('nikhil', '2')])
ini_dict2 = OrderedDict([("manjeet", '4'), ("akash", '4')])
# adding in beginning of dict
both = OrderedDict(list(ini_dict2.items()) + list(ini_dict1.items()))
# print result
print ("Resultant Dictionary :"+str(both))
输出:
结果字典:ordereddct([(' manjeet ',' 4 '),(' akash ',' 4 '),(' akshat ',' 1 '),(' nikhil ',' 2')])
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