大约有 47,000 项符合查询结果（耗时：0.0938秒） [XML]
How to form tuple column from two columns in Pandas
...rtable with zip. It comes in handy when dealing with column data.
df['new_col'] = list(zip(df.lat, df.long))
It's less complicated and faster than using apply or map. Something like np.dstack is twice as fast as zip, but wouldn't give you tuples.
...
Rebasing remote branches in Git
...
@r_: Please read my answer. It might help you in your understanding of what you're doing :)
– ralphtheninja
Jun 1 '11 at 19:28
...
Rails: Using build with a has_one association in rails
... later on create a profile for that user. I tried using build with a has_one association but that blew up. The only way I see this working is using has_many . The user is supposed to only have at most one profile .
...
postgresql COUNT(DISTINCT …) very slow
...
You can use this:
SELECT COUNT(*) FROM (SELECT DISTINCT column_name FROM table_name) AS temp;
This is much faster than:
COUNT(DISTINCT column_name)
share
|
improve this answer
...
Inserting a Link to a Webpage in an IPython Notebook
...
For visual learners.
[blue_text](url_here)
Thanks dbliss.
share
|
improve this answer
|
follow
|
...
Assign one struct to another in C
...ree() because they are automatic variables: en.wikipedia.org/wiki/Automatic_variable
– joshdoe
Jun 19 '12 at 16:32
|
show 1 more comment
...
How to use Swift @autoclosure
...answered Jun 8 '14 at 5:28
eddie_ceddie_c
3,31711 gold badge1212 silver badges66 bronze badges
...
How to Test a Concern in Rails
...t I have a Personable concern in my Rails 4 application which has a full_name method, how would I go about testing this using RSpec?
...
JavaScript regex multiline flag doesn't work
...
Can I use: caniuse.com/#feat=mdn-javascript_builtins_regexp_dotall MDN: developer.mozilla.org/ru/docs/Web/JavaScript/Reference/…
– Filyus
Aug 19 at 9:44
...
Does Entity Framework Code First support stored procedures?
...ng the built in Database object: context.Database.SqlQuery<Dummy>("sp_GetDummy");
– Steven K.
Mar 23 '11 at 18:50
|
show 2 more commen...