大约有 32,000 项符合查询结果（耗时：0.0450秒） [XML]
Pandas DataFrame Groupby two columns and get counts
...s not necessary to do. You can simply sort all the values descendingly and then keep only the rows with the first occurrence of col2 with the drop_duplicates method.
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How to print like printf in Python3?
...A simpler one.
def printf(format, *values):
print(format % values )
Then:
printf("Hello, this is my name %s and my age %d", "Martin", 20)
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JavaScript: remove event listener
...ts.
If you don't want that, and want each one to have its own counter, then do this:
var myClick = function( click_count ) {
var handler = function(event) {
click_count++;
if(click_count == 50) {
// to remove
canvas.removeEventListener('click', handler)...
Rails 3 migrations: Adding reference column?
...is instead:
rails g migration add_user_id_to_tester user_id:integer
And then manually add belongs_to :user in the Tester model
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How do you check if a selector matches something in jQuery? [duplicate]
...er- you can do:
jQuery.fn.exists = function(){return this.length>0;}
Then in your code you can use
if ($(selector).exists()) {
// Do something
}
As answered here
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HttpUtility does not exist in the current context
...n -> Target Framework -> select ".Net Framework 4"
the project will then save and reload.
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CS0120: An object reference is required for the nonstatic field, method, or property 'foo'
...e, where you want to get a Control of a Form and are receiving this error, then I have a little bypass for you.
Go to your Program.cs and change
Application.Run(new Form1());
to
public static Form1 form1 = new Form1(); // Place this var out of the constructor
Application.Run(form1);
Now you c...
Regular Expression: Any character that is NOT a letter or number
...
Space characters would match, but then would be replaced by space characters, so in effect it would leave them alone (a space will stay a space).
– jimbo
Jun 7 '10 at 18:42
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Get String in YYYYMMDD format from JS date object?
... If you are in a +1 timezone, and have a date [2015-09-01 00:00:00 GMT+1], then the toISOString() method will return the string '2015-08-31T23:00:00.000Z' because the date is converted to UTC/0-offset before being stringified.
– Luke Baulch
Sep 13 '15 at 2:44
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Can I force pip to reinstall the current version?
...to force a reinstallation by first uninstalling (with pip uninstall ) and then installing, but is there a way to simply force an "update" to a nominally current version in a single step?
...