Python|按日期对给定的字典列表进行排序
给定一个字典列表，任务是按日期对字典进行排序。让我们看一些解决任务的方法。
方法#1：使用朴素的方法
# Python code to demonstrate
# sort a list of dictionary
# where value date is in string
# Initialising list of dictionary
ini_list = [{'name':'akash', 'd.o.b':'1997-03-02'},
{'name':'manjeet', 'd.o.b':'1997-01-04'},
{'name':'nikhil', 'd.o.b':'1997-09-13'}]
# printing initial list
print ("initial list : ", str(ini_list))
# code to sort list on date
ini_list.sort(key = lambda x:x['d.o.b'])
# printing final list
print ("result", str(ini_list))
initial list : [{‘name’: ‘akash’, ‘d.o.b’: ‘1997-03-02’}, {‘name’: ‘manjeet’, ‘d.o.b’: ‘1997-01-04’}, {‘name’: ‘nikhil’, ‘d.o.b’: ‘1997-09-13’}]
result [{‘name’: ‘manjeet’, ‘d.o.b’: ‘1997-01-04’}, {‘name’: ‘akash’, ‘d.o.b’: ‘1997-03-02’}, {‘name’: ‘nikhil’, ‘d.o.b’: ‘1997-09-13’}]
方法 #2：使用datetime.strptime和lambda
# Python code to demonstrate
# sort a list of dictionary
# where value date is in a string
from datetime import datetime
# Initialising list of dictionary
ini_list = [{'name':'akshat', 'd.o.b':'1997-09-01'},
{'name':'vashu', 'd.o.b':'1997-08-19'},
{'name':'manjeet', 'd.o.b':'1997-01-04'},
{'name':'nikhil', 'd.o.b':'1997-09-13'}]
# printing initial list
print ("initial list : ", str(ini_list))
# code to sort list on date
ini_list.sort(key = lambda x: datetime.strptime(x['d.o.b'], '%Y-%m-%d'))
# printing final list
print ("result", str(ini_list))
initial list : [{‘d.o.b’: ‘1997-09-01’, ‘name’: ‘akshat’}, {‘d.o.b’: ‘1997-08-19’, ‘name’: ‘vashu’}, {‘d.o.b’: ‘1997-01-04’, ‘name’: ‘manjeet’}, {‘d.o.b’: ‘1997-09-13’, ‘name’: ‘nikhil’}]
result [{‘d.o.b’: ‘1997-01-04’, ‘name’: ‘manjeet’}, {‘d.o.b’: ‘1997-08-19’, ‘name’: ‘vashu’}, {‘d.o.b’: ‘1997-09-01’, ‘name’: ‘akshat’}, {‘d.o.b’: ‘1997-09-13’, ‘name’: ‘nikhil’}]
方法 #3：使用operator.itemgetter
# Python code to demonstrate
# sort a list of dictionary
# where value date is in string
import operator
# Initialising list of dictionary
ini_list = [{'name':'akash', 'd.o.b':'1997-03-02'},
{'name':'manjeet', 'd.o.b':'1997-01-04'},
{'name':'nikhil', 'd.o.b':'1997-09-13'}]
# printing initial list
print ("initial list : ", str(ini_list))
# code to sort list on date
ini_list.sort(key = operator.itemgetter('d.o.b'))
# printing final list
print ("result", str(ini_list))
initial list : [{‘d.o.b’: ‘1997-03-02’, ‘name’: ‘akash’}, {‘d.o.b’: ‘1997-01-04’, ‘name’: ‘manjeet’}, {‘d.o.b’: ‘1997-09-13’, ‘name’: ‘nikhil’}]
result [{‘d.o.b’: ‘1997-01-04’, ‘name’: ‘manjeet’}, {‘d.o.b’: ‘1997-03-02’, ‘name’: ‘akash’}, {‘d.o.b’: ‘1997-09-13’, ‘name’: ‘nikhil’}]