大约有 22,000 项符合查询结果（耗时：0.0264秒） [XML]
if else in a list comprehension [duplicate]
...
>>> l = [22, 13, 45, 50, 98, 69, 43, 44, 1]
>>> [x+1 if x >= 45 else x+5 for x in l]
[27, 18, 46, 51, 99, 70, 48, 49, 6]
Do-something if <condition>, else do-something else.
...
How to change an application icon programmatically in Android?
... // gray
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(50);
new Canvas(bitmap).drawText(""+number, 50, 50, paint);
((ImageView) findViewById(R.id.icon)).setImageBitmap(bitmap);
// Decorate the shortcut
Intent addIntent = new Intent();
addIntent.putExtra(Inten...
C# - What does the Assert() method do? Is it still useful?
... system assumes that a customer-information
file will never have more than 50,000 records, the program might
contain an assertion that the number of records is less than or equal
to 50,000. As long as the number of records is less than or equal to
50,000, the assertion will be silent. If it encounte...
UIButton Long Press Event
...ue as tag number
btn.title = @"Press Me";
[btn setFrame:CGRectMake(50.0, 50.0, 60.0, 60.0)];
// now create a long press gesture
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressTap:)];
[btn addGestureRec...
How to write Unicode characters to the console?
...00; i++) {
Console.Write(Strings.ChrW(i));
if (i % 50 == 0) { // break every 50 chars
Console.WriteLine();
}
}
Console.ReadKey();
}
}
VB.NET
imports Microsoft.VisualBasic
imports System
public module ConsoleOutputTest
S...
Best way to store date/time in mongodb
... db.test.find()
{ "_id" : ObjectId("..."), "date" : ISODate("2014-02-10T10:50:42.389Z") }
{ "_id" : ObjectId("..."), "date" : ISODate("2014-02-10T10:50:57.240Z") }
The native type supports a whole range of useful methods out of the box, which you can use in your map-reduce jobs, for example.
If y...
What are the differences between the threading and multiprocessing modules?
...in IO-bound scenarios. These results are from a 40-processor IBM System x3650 M4 BD.
IO-Bound Processing : Process Pool performed better than Thread Pool
>>> do_work(50, 300, 'thread','fileio')
do_work function took 455.752 ms
>>> do_work(50, 300, 'process','fileio')
do_work fun...
Why use multiple columns as primary keys (composite primary key)
...rimary key.
Create Table Person(
PersonID int Not Null,
FirstName varchar(50),
LastName varchar(50),
Constraint PK_Person PRIMARY KEY (PersonID))
Create Table Group (
GroupId int Not Null,
GroupName varchar(50),
Constraint PK_Group PRIMARY KEY (GroupId))
Create Table GroupMember (
GroupId int Not...
How to limit the maximum value of a numeric field in a Django model?
...t the above code):
size = fields.IntegerRangeField(min_value=1, max_value=50)
OR for a range of negative and positive (like an oscillator range):
size = fields.IntegerRangeField(min_value=-100, max_value=100)
What would be really cool is if it could be called with the range operator like this:...
SQLite - increase value by a certain number
...
Sample 1 (for all rows):
UPDATE Products SET Price = Price + 50
Sample 2 (for a specific row):
UPDATE Products SET Price = Price + 50 WHERE ProductID = 1
Sample 3 (generic):
UPDATE {Table} SET {Column} = {Column} + {Value} WHERE {Condition}
Where:
{Table} - table name
{Column...