创建有序字典
import collectionsdic = collections.OrderedDict()dic['k1'] = 'v1'dic['k2'] = 'v2'dic['k3'] = 'v3'print(dic)#输出:OrderedDict([('k1', 'v1'), ('k2', 'v2'), ('k3', 'v3')])
登录后复制
clear(清空有序字典)
import collectionsdic = collections.OrderedDict()dic['k1'] = 'v1'dic['k2'] = 'v2'dic.clear()print(dic)#输出:OrderedDict()
登录后复制
copy(拷贝)
import collectionsdic = collections.OrderedDict()dic['k1'] = 'v1'dic['k2'] = 'v2'new_dic = dic.copy()print(new_dic)#输出:OrderedDict([('k1', 'v1'), ('k2', 'v2')])
登录后复制
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)
import collectionsdic = 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)])
登录后复制
items(返回由“键值对组成元素“的列表)
import collectionsdic = collections.OrderedDict()dic['k1'] = 'v1'dic['k2'] = 'v2'print(dic.items())#输出:odict_items([('k1', 'v1'), ('k2', 'v2')])
登录后复制
keys(获取字典所有的key)
import collectionsdic = collections.OrderedDict()dic['k1'] = 'v1'dic['k2'] = 'v2'print(dic.keys())# 输出:odict_keys(['k1', 'k2'])
登录后复制
move_to_end(指定一个key,把对应的key-value移到最后)
import collectionsdic = 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')])
登录后复制
pop(获取指定key的value,并在字典中删除)
import collectionsdic = 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')])
登录后复制
popitem(按照后进先出原则,删除最后加入的元素,返回key-value)
import collectionsdic = 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')])
登录后复制
setdefault(获取指定key的value,如果key不存在,则创建)
import collectionsdic = 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)])
登录后复制
values(获取字典所有的value,返回一个列表)
import collectionsdic = collections.OrderedDict()dic['k1'] = 'v1'dic['k2'] = 'v2'dic['k3'] = 'v3'print(dic.values())# 输出:odict_values(['v1', 'v2', 'v3'])
登录后复制
以上就是python3 OrderedDict类(有序字典)使用方法的详细内容,更多请关注【创想鸟】其它相关文章!
版权声明:本文内容由互联网用户自发贡献,该文观点仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容, 请发送邮件至253000106@qq.com举报,一经查实,本站将立刻删除。
发布者:PHP中文网,转转请注明出处:https://www.chuangxiangniao.com/p/2275528.html