value-sort | Fast and iterable data structure for sorting bounded values | 3D Printing library
kandi X-RAY | value-sort Summary
kandi X-RAY | value-sort Summary
Fast and iterable data structure for sorting bounded values
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QUESTION
I would like to sort a numerical list by the frequencies of the elements. (I found several ways to do it.)
During my exploration, I tried the below example.
Question : How does list.sort(key=list.count) works? Is it possible to use list.count() during list.sort()?
I read that the key-function is evaluated for each element of the list before the sort and those values are used for the comparisons during the sort.
Also, I read somewhere that during sort() the list is kind of locked. (sorry, I can't find the reference now - I've read quite a lot of blogs and tutorials on this topic in the last few hours, Python documentation and How-To Sort included)
This is the example
...ANSWER
Answered 2020-Jul-09 at 21:31data = [22, 11, 33, 99, 88, 77, 22, 44, 55, 44, 66, 22]
data.sort()
a,s,z,p=[],[],[],{}
for i in data:
if i not in s:
s.append(i)
t=data.count(i)
a.append(t)
for i in range(len(a)):
p[s[i]]=a[i]
for u,m in sorted(p.items(),key=lambda x: x[1]):
z.append(u)
print(z)
QUESTION
I am trying to sort a mutable.Map[String, String] by getting the string and sorting with the numbers inside the string. Input:
...ANSWER
Answered 2020-Jun-12 at 23:57You need to get the number from you string and convert it to Integer, for example:
QUESTION
I am trying to get a largest value of a primary key (id in a particular case) using boto3.
Table structure:
| id | name |
|-----|-------|
| 1 | Bob |
| 4 | Alice |
| 5 | Eve |
where id is a primary key (hash key) and there is no sort key (range key).
As a result, I should get 5 (the id largest value).
I have looked thought docs and this answer but didn't find an answer.
ScanIndexForward attribute from table.scan() method requires sort key. table.query() method requires condition (such as Key={"name":"Bob"}).
The id value is not autoincrementing (table may have missing id values) that is why this solution doesn't help.
Question: Is it possible to get largest id from a table without sort key? (Of course, I do not want to scan all table and find it using python.)
Thanks for reading!
...ANSWER
Answered 2018-Nov-03 at 13:45It's probably not what you want to hear- but you can't do this using table operations directly.
Dynamo gives you a lot of constraints in the name of making a scalable system. And most of these surround the options you have for querying; offering more of a key'd document store then a traditional database (further discussion about using scan with some, dubious, suggestions).
I suggest you take a look at the way you need to access your data and consider your schema design within the limits of partition/sort/indexes.
For situations like this (e.g. when you need to derive a property from the table), an architectural pattern you can use is:
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