如何正确排序Python字典中的项目? [英] How to properly sort items in a Python dictionary?

问题描述

我已经在python中创建了一个字典来处理购买的更改.

I have created a dictionary in python to deal handle the change for a purchase.

money = { '$100.00' : 0, '$50.00' :  0, '$20.00' : 0,'$10.00' : 0,
              '$5.00' : 0, '$1.00' : 0,'$0.25' : 0, '$0.10' : 0, '$0.05' : 0,
              '$0.01' : 0}

但是，当我要打印此货币时，我似乎无法从最小到最大"的货币进行打印.

However when I want to print this, I can't seem to be able to do this from "least to greatest" piece of currency.

这是我尝试对它进行排序的步骤:

This is what I have done in an attempt to sort it:

keyList = list(money.keys())
keyList.sort()
for key in keyList:
    print(key, money[key])

但是给出的结果从... $ 1-> $ 10-> $ 100-> $ 20 ...有任何建议，它将是$ 1-> $ 5-> $ 10 ...?

However the result given goes from ...$1 -> $10 -> $100 -> $20...Any suggestions so it will be $1 -> $5 -> $10...?

推荐答案

之所以会这样，是因为您正在对字符串进行排序，这些字符串按字典顺序排序(如果在英语词典中，则显示顺序).

This is happening because you are sorting strings, which are sorted lexicographically (order in which it would show up if it was in an English dictionary).

您想要的是按浮点值对它们进行排序，可以这样进行:

What you want is to sort them by their floatified values, which can be done like this:

>>> money = { '$100.00' : 0, '$50.00' :  0, '$20.00' : 0,'$10.00' : 0,
...               '$5.00' : 0, '$1.00' : 0,'$0.25' : 0, '$0.10' : 0, '$0.05' : 0,
...               '$0.01' : 0}
>>> for val in sorted(money, key=lambda s: float(s.lstrip("$"))):
...     print(val, money[val])
... 
$0.01 0
$0.05 0
$0.10 0
$0.25 0
$1.00 0
$5.00 0
$10.00 0
$20.00 0
$50.00 0
$100.00 0

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