大约有 43,069 项符合查询结果（耗时：0.0382秒） [XML]
Unique Key constraints for multiple columns in Entity Framework
...
With Entity Framework 6.1, you can now do this:
[Index("IX_FirstAndSecond", 1, IsUnique = true)]
public int FirstColumn { get; set; }
[Index("IX_FirstAndSecond", 2, IsUnique = true)]
public int SecondColumn { get; set; }
The second parameter in ...
How to jQuery clone() and change id?
I need to clone the id and then add a number after it like so id1 , id2 , etc. Everytime you hit clone you put the clone after the latest number of the id.
...
Is it possible to install another version of Python to Virtualenv?
...
12 Answers
12
Active
...
How to check SQL Server version
...
Following are possible ways to see the version:
Method 1: Connect to the instance of SQL Server, and then run the following query:
Select @@version
An example of the output of this query is as follows:
Microsoft SQL Server 2008 (SP1) - 10.0.2531.0 (X64) Mar 29 2009
10:11:5...
Sequence contains more than one element
... This method will only succeed when the collections contains exactly 0 or 1 element. I believe you are looking for FirstOrDefault which will succeed no matter how many elements are in the collection.
share
|
...
super() fails with error: TypeError “argument 1 must be type, not classobj” when parent does not inh
...his is why you got the error message you saw:
TypeError: super() argument 1 must be type, not classobj
Try this to see for yourself:
class OldStyle:
pass
class NewStyle(object):
pass
print type(OldStyle) # prints: <type 'classobj'>
print type(NewStyle) # prints <type 'type'&g...
Using try vs if in python
...surements:
>>> import timeit
>>> timeit.timeit(setup="a=1;b=1", stmt="a/b") # no error checking
0.06379691968322732
>>> timeit.timeit(setup="a=1;b=1", stmt="try:\n a/b\nexcept ZeroDivisionError:\n pass")
0.0829463709378615
>>> timeit.timeit(setup="a=1;b=0", stmt=...
What's the difference between Task.Start/Wait and Async/Await?
...
answered Mar 1 '12 at 16:04
Eric LippertEric Lippert
599k164164 gold badges11551155 silver badges20142014 bronze badges
...
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.
...