嗨喽~大家好呀,这里是魔王呐 ❤ ~!
python更多源码/资料/解答/教程等 点击此处跳转文末名片免费获取
创建有序字典
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
dic['k3'] = 'v3'
print(dic)
#输出:OrderedDict([('k1', 'v1'), ('k2', 'v2'), ('k3', 'v3')])
clear(清空有序字典)
'''
遇到问题没人解答?小编创建了一个Python学习交流QQ群:926207505
寻找有志同道合的小伙伴,互帮互助,群里还有不错的视频学习教程和PDF电子书!
'''
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
dic.clear()
print(dic)
#输出:OrderedDict()
copy(拷贝)
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
new_dic = dic.copy()
print(new_dic)
#输出:OrderedDict([('k1', 'v1'), ('k2', 'v2')])
fromkeys(指定一个列表,把列表中的值作为字典的key,生成一个字典)
'''
遇到问题没人解答?小编创建了一个Python学习交流QQ群:926207505
寻找有志同道合的小伙伴,互帮互助,群里还有不错的视频学习教程和PDF电子书!
'''
import collections
dic = collections.OrderedDict()
name = ['tom','lucy','sam']
print(dic.fromkeys(name))
print(dic.fromkeys(name,20))
#输出:OrderedDict([('tom', None), ('lucy', None), ('sam', None)])
# OrderedDict([('tom', 20), ('lucy', 20), ('sam', 20)])
items(返回由“键值对组成元素“的列表)
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
print(dic.items())
#输出:odict_items([('k1', 'v1'), ('k2', 'v2')])
keys(获取字典所有的key)
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
print(dic.keys())
# 输出:odict_keys(['k1', 'k2'])
move_to_end(指定一个key,把对应的key-value移到最后)
'''
遇到问题没人解答?小编创建了一个Python学习交流QQ群:926207505
寻找有志同道合的小伙伴,互帮互助,群里还有不错的视频学习教程和PDF电子书!
'''
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
dic['k3'] = 'v3'
dic.move_to_end('k1')
print(dic)
# 输出:OrderedDict([('k2', 'v2'), ('k3', 'v3'), ('k1', 'v1')])
pop(获取指定key的value,并在字典中删除)
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
dic['k3'] = 'v3'
k = dic.pop('k2')
print(k,dic)
# 输出:v2 OrderedDict([('k1', 'v1'), ('k3', 'v3')])
popitem(按照后进先出原则,删除最后加入的元素,返回key-value)
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
dic['k3'] = 'v3'
print(dic.popitem(),dic)
print(dic.popitem(),dic)
# 输出:('k3', 'v3') OrderedDict([('k1', 'v1'), ('k2', 'v2')])
# ('k2', 'v2') OrderedDict([('k1', 'v1')])
setdefault(获取指定key的value,如果key不存在,则创建)
'''
遇到问题没人解答?小编创建了一个Python学习交流QQ群:926207505
寻找有志同道合的小伙伴,互帮互助,群里还有不错的视频学习教程和PDF电子书!
'''
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
dic['k3'] = 'v3'
val = dic.setdefault('k5')
print(val,dic)
# 输出:None OrderedDict([('k1', 'v1'), ('k2', 'v2'), ('k3', 'v3'), ('k5', None)])
values(获取字典所有的value,返回一个列表)
import collections
dic = collections.OrderedDict()
dic['k1'] = 'v1'
dic['k2'] = 'v2'
dic['k3'] = 'v3'
print(dic.values())
# 输出:odict_values(['v1', 'v2', 'v3'])
尾语
最后感谢你观看我的文章呐~本次航班到这里就结束啦 🛬
希望本篇文章有对你带来帮助 🎉,有学习到一点知识~
躲起来的星星🍥也在努力发光,你也要努力加油(让我们一起努力叭)。