大约有 47,000 项符合查询结果（耗时：0.0347秒） [XML]
How to wait for several Futures?
...
You could use a for-comprehension as follows instead:
val fut1 = Future{...}
val fut2 = Future{...}
val fut3 = Future{...}
val aggFut = for{
f1Result <- fut1
f2Result <- fut2
f3Result <- fut3
} yield (f1Result, f2Result, f3R...
Run an Application in GDB Until an Exception Occurs
...Setting catchpoints
You can use catchpoints to cause the debugger to stop for certain kinds of program events, such as C++ exceptions or the loading of a shared library. Use the catch command to set a catchpoint.
catch event
Stop when event occurs. event can be any of the following:
throw
...
(this == null) in C#!
...
make a debugger visualizer (DebuggerDisplay) for whatever 'this' is, and make that fool you that's null? :D just sayin'
– user90843
Apr 12 '13 at 9:10
...
Python unittest - opposite of assertRaises?
...act. The solution proposed by user9876 is conceptually flawed: if you test for the non-raising of say ValueError, but ValueError is instead raised, your test must exit with a failure condition, not an error one. On the other hand, if in running the same code you would raise a KeyError, that would be...
How to import multiple .csv files at once?
...ou could do the following with assign:
temp = list.files(pattern="*.csv")
for (i in 1:length(temp)) assign(temp[i], read.csv(temp[i]))
Or, without assign, and to demonstrate (1) how the file name can be cleaned up and (2) show how to use list2env, you can try the following:
temp = list.files(pat...
How do you express binary literals in Python?
...
For reference—future Python possibilities:
Starting with Python 2.6 you can express binary literals using the prefix 0b or 0B:
>>> 0b101111
47
You can also use the new bin function to get the binary representati...
How can I create a unique constraint on my column (SQL Server 2008 R2)?
...h the GUI:
Make sure your column does not violate the unique constraint before you begin.
Open SQL Server Management Studio.
Right click your Table, click "Design".
Right click the column you want to edit, a popup menu appears, click Indexes/Keys.
Click the "Add" Button.
Expand the "General" tab....
Pythonic way to combine FOR loop and IF statement
I know how to use both for loops and if statements on separate lines, such as:
10 Answers
...
How to use the pass statement?
...ly don't think this properly answers the question. Citing one possible use for something, even if it is the most common use for it, is not the same as explaining what it is for.
– Schilcote
Mar 15 '14 at 17:47
...
Slow Requests on Local Flask Server
... browsers can be painfully slow if accessing your local server. The reason for this is that sometimes “localhost” is configured to be available on both ipv4 and ipv6 socktes and some browsers will try to access ipv6 first and then ivp4.
So the fix is to disable ipv6 from the localhost by comm...