大约有 47,000 项符合查询结果（耗时：0.0500秒） [XML]
Xcode doesn't see my iOS device but iTunes does
...
Select Window ➜ Organizer in Xcode.
Now under Devices, select your device.
If it is not ready for development then click use for development.
If above doesn't solve your problem then from your project settings, set deployment target to one which your app is dev...
Usage of __slots__?
...dict__, you must subclass object:
class Base(object):
__slots__ = ()
now:
>>> b = Base()
>>> b.a = 'a'
Traceback (most recent call last):
File "<pyshell#38>", line 1, in <module>
b.a = 'a'
AttributeError: 'Base' object has no attribute 'a'
Or subclass anoth...
Proper use of the IDisposable interface
I know from reading the Microsoft documentation that the "primary" use of the IDisposable interface is to clean up unmanaged resources.
...
What's the difference if I put css file inside or ?
... @Kpym You're 3 years late to the party;-) But you are correct, style is now a flow element and the scoped attribute has been obsoleted.
– Christoph
Jan 10 '18 at 18:54
...
Python nonlocal statement
...: 2
# outer: 1
# global: 0
To this, using nonlocal, where inner()'s x is now also outer()'s x:
x = 0
def outer():
x = 1
def inner():
nonlocal x
x = 2
print("inner:", x)
inner()
print("outer:", x)
outer()
print("global:", x)
# inner: 2
# outer: 2
# global...
Is there a Python function to determine which quarter of the year a date is in?
...nge(1, 13):
print (m-1)//3 + 1,
print
gives 1 1 1 2 2 2 3 3 3 4 4 4 -- now doesn't this look vastly preferable to you?-)
This proves that the question is well warranted, I think;-).
I don't think the datetime module should necessarily have every possible useful calendric function, but I do kno...
Swift: Testing optionals for nil
...ing with possXYZ (the unwrapped value of xyz)
} else {
// do something now that we know xyz is .None
}
This way you can both test if xyz contains a value and if so, immediately work with that value.
With regards to your compiler error, the type UInt8 is not optional (note no '?') and therefor...
Pointers in Python?
I know Python doesn't have pointers, but is there a way to have this yield 2 instead
9 Answers
...
How to use java.String.format in Scala?
...ethod of a string. But if I place %1, %2, etc. in the string, java.util.UnknownFormatConversionException is thrown pointing to a confusing Java source code piece:
...
ReadOnlyCollection or IEnumerable for exposing member collections?
...s it just me or is this an answer to a different question? It's useful to know this "solution", but the op has asked for a comparison between returning a ReadOnlyCollection and IEnumerable. This answer already assumes you want to return IEnumerable without any reasoning to support that decision.
...