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How to count the frequency of the elements in an unordered list?
...
Note: You should sort the list before using groupby.
You can use groupby from itertools package if the list is an ordered list.
a = [1,1,1,1,2,2,2,2,3,3,4,5,5]
from itertools import groupby
[len(list(group)) for key, group in groupby(a)]
Output:
[4, 4, 2, 1, 2]
...
Regular expression search replace in Sublime Text 2
...ntation on this is rather anemic. Specifically, I want to do a replace on groups, so something like converting this text:
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Pandas DataFrame Groupby two columns and get counts
...s answer, you can do following to solve your second question:
In [56]: df.groupby(['col5','col2']).size().reset_index().groupby('col2')[[0]].max()
Out[56]:
0
col2
A 3
B 2
C 1
D 3
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How do I get the MAX row with a GROUP BY in LINQ query?
...
{
var q = from t in dc.TableTests
group t by t.SerialNumber
into g
select new
{
SerialNumber = g.Key,
uid = (from t2 in g select t2...
Regular expression to match a word or its prefix
...f: s, |, s (again), e, a, s (again), o and n.
Use parentheses instead for grouping:
(s|season)
or non-capturing group:
(?:s|season)
Note: Non-capture groups tell the engine that it doesn't need to store the match, while the other one (capturing group does). For small stuff, either works, fo...
What does .SD stand for in data.table in R
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@Josh Because the group variables are available in j, too, and are length 1. by=list(x,y,z) would mean x,y and z are available to j. For generic access they're wrapped up in .BY too. FAQ 2.10 has some history on it, but some clarity could be a...
Select top 10 records for each category
...H TOPTEN AS (
SELECT *, ROW_NUMBER()
over (
PARTITION BY [group_by_field]
order by [prioritise_field]
) AS RowNo
FROM [table_name]
)
SELECT * FROM TOPTEN WHERE RowNo <= 10
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Using Java to find substring of a bigger string using Regular Expression
...match your string and put the text within the square brackets in the first group. Have a look at the Pattern API Documentation for more information.
To extract the string, you could use something like the following:
Matcher m = MY_PATTERN.matcher("FOO[BAR]");
while (m.find()) {
String s = m.g...
Why does 2 mod 4 = 2?
...
Much easier if u use bananas and a group of people.
Say you have 1 banana and group of 6 people, this you would express: 1 mod 6 / 1 % 6 / 1 modulo 6.
You need 6 bananas for each person in group to be well fed and happy.
So if you then have 1 banana an...
file_put_contents - failed to open stream: Permission denied
... of the owner of the files. The second digit the permissions of a specific group of users. The third digit defines the permissions for all users who are not the owner nor member of the group.
The webserver is supposed to execute with an id that is a member of the group. The webserver should never r...