我有字典
from collections import OrderedDict
md = {"r3":"piz","r1":"pic","r9":"piz","r12":"pic","r19":"lia","r2":"kurcc","r21":"jes","r99":"pic","r111":"kurcc","r116":"kurcc","r211":"ar","r221":"buc"}
print (OrderedDict(sorted(md.items(), key=lambda t: t[0])))
我想从最低的数字开始排序。但是我得到了
OrderedDict([('r1', 'pic'), ('r111', 'kurcc'), ('r116', 'kurcc'), ('r12', 'pic'), ('r19', 'lia'), ('r2', 'kurcc'), ('r21', 'jes'), ('r211', 'ar'), ('r221', 'buc'), ('r3', 'piz'), ('r9', 'piz'), ('r99', 'pic')])
如何更改代码以使r1,r2,r3顺序?
答案 0 :(得分:5)
如果所有密钥的格式为'r???'
且???
为整数,我们可以使用以下排序键:
OrderedDict(sorted(md.items(), key=lambda t: int(t[0][1:])))
所以在这里我们首先使用t[0]
来获取密钥,就像你自己做的那样。接下来,我们获取从索引1开始的子字符串(因此我们删除'r'
),最后我们将其转换为int(..)
以执行数值比较。
这会产生:
>>> OrderedDict(sorted(md.items(), key=lambda t: int(t[0][1:])))
OrderedDict([('r1', 'pic'), ('r2', 'kurcc'), ('r3', 'piz'), ('r9', 'piz'), ('r12', 'pic'), ('r19', 'lia'), ('r21', 'jes'), ('r99', 'pic'), ('r111', 'kurcc'), ('r116', 'kurcc'), ('r211', 'ar'), ('r221', 'buc')])