大约有 47,000 项符合查询结果（耗时：0.0620秒） [XML]
Using 'return' in a Ruby block
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170
Simply use next in this context:
$ irb
irb(main):001:0> def thing(*args, &block)
irb(mai...
Get the first element of each tuple in a list in Python [duplicate]
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Use a list comprehension:
res_list = [x[0] for x in rows]
Below is a demonstration:
>>> rows = [(1, 2), (3, 4), (5, 6)]
>>> [x[0] for x in rows]
[1, 3, 5]
>>>
Alternately, you could use unpacking instead of x[0]:
res_list = [x for...
How to enter in a Docker container already running with a new TTY
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1106
With docker 1.3, there is a new command docker exec. This allows you to enter a running contain...
ViewPager with Google Maps API v2: mysterious black view
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+50
I was able to stop the black surface being left behind after transition by placing another view with a transparent background on top o...
Text overflow ellipsis on two lines
...</p>
</div>
</div>
CSS:
html,body,p {
margin: 0;
padding: 0;
font-family: sans-serif;
}
.ellipsis {
overflow: hidden;
height: 200px;
line-height: 25px;
margin: 20px;
border: 5px solid #AAA;
}
.ellipsis:before {
content: "";
float: left...
Ant task to run an Ant target only if a file exists?
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200
Available and Condition
<target name="check-abc">
<available file="abc.txt" prope...
How to get a variable value if variable name is stored as string?
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answered Dec 17 '09 at 12:09
Phil RossPhil Ross
22.5k99 gold badges6666 silver badges7474 bronze badges
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What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
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+50
What is wchar_t?
wchar_t is defined such that any locale's char encoding can be converted to a wchar_t representation where every wch...
Foreign key constraints: When to use ON UPDATE and ON DELETE
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490
Do not hesitate to put constraints on the database. You'll be sure to have a consistent database...
What is the best Java email address validation method? [closed]
...sing it to not accept valid emails from new TLDs.
This bug was resolved on 03/Jan/15 02:48 in commons-validator version 1.4.1
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edited Jun 20 at 9:12
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