大约有 23,000 项符合查询结果（耗时：0.0379秒） [XML]
Pandas aggregate count distinct
...
Just adding to the answers already given, the solution using the string "nunique" seems much faster, tested here on ~21M rows dataframe, then grouped to ~2M
%time _=g.agg({"id": lambda x: x.nunique()})
CPU times: user 3min 3s, sys: 2.94 s, total: 3min 6s
Wall time: 3min 20s
%time _=g.ag...
How does one use rescue in Ruby without the begin and end block
...nline:
1 + "str" rescue "EXCEPTION!"
will print out "EXCEPTION!" since 'String can't be coerced into Fixnum'
share
|
improve this answer
|
follow
|
...
Hidden features of HTML
...ditable attribute is an enumerated attribute whose keywords are the empty string, true, and false" - w3.org/TR/html5/editing.html
– Quentin
Jul 23 '09 at 9:33
2
...
Difference between modes a, a+, w, w+, and r+ in built-in open function?
...BSD fopen manpage defines them as follows:
The argument mode points to a string beginning with one of the following
sequences (Additional characters may follow these sequences.):
``r'' Open text file for reading. The stream is positioned at the
beginning of the file.
``r+'' Open ...
How can I add an ampersand for a value in a ASP.net/C# app config file value
...
This works, but I have to put a string.Replace("&","&") whereever I access this setting, or else the browser won't properly detect it when you click on the link :/
– DLeh
May 16 '14 at 15:37
...
How to join components of a path when you are constructing a URL in Python
...
If you want the result to be a string you can add .url at the end: furl.furl('/media/path/').add(path='js/foo.js').url
– Eyal Levin
Oct 31 '17 at 12:15
...
Resharper- Find all unused classes
...r();
}
public static void RegisterFromAssembly(Assembly assembly, string classEndsWith, LifeTime lifeTime)
{
var lifestyle = ConvertLifeStyleType(lifeTime);
_container.Register(AllTypes.FromAssembly(assembly)
.Where(type => type.Name.EndsWith(classE...
How to change color in markdown cells ipython/jupyter notebook?
I'm only looking to format a specific string within a cell. I change that cell's format to "Markdown" but I'm not sure how to change text color of a single word.
...
Permanently Set Postgresql Schema Path
...
Yes, those are identifiers, not strings.
– Ludovic Kuty
Aug 27 at 7:15
add a comment
|
...
Handler is abstract ,cannot be instantiated
...tView;
public class ActionActivity extends ActionBarActivity {
final String LOG_TAG = "myLogs";
TextView tvInfo;
Button btnStart;
Handler h;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.la...