大约有 48,000 项符合查询结果（耗时：0.0992秒） [XML]
Python Dictionary Comprehension
...to add keys to an existing dictionary. Also, you have to specify the keys and values, although of course you can specify a dummy value if you like.
>>> d = {n: n**2 for n in range(5)}
>>> print d
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16}
If you want to set them all to True:
>>>...
How to use ConcurrentLinkedQueue?
...o I just have to define two methods (one to retrive elements from the list and another to add elements to the list)?
Note: obviously these two methods have to be synchronized. Right?
...
Allowed characters in Linux environment variable names
...llowed in Linux environment variable names? My cursory search of man pages and the web did only produce information about how to work with variables, but not which names are allowed.
...
install / uninstall APKs programmatically (PackageManager vs Intents)
My application installs other applications, and it needs to keep track of what applications it has installed. Of course, this could be achieved by simply keeping a list of installed applications. But this should not be necessary! It should be the responsibility of the PackageManager to maintain the ...
Difference between UTF-8 and UTF-16?
Difference between UTF-8 and UTF-16?
Why do we need these?
5 Answers
5
...
In Subversion can I be a user other than my login name?
...
Most Subversion commands take the --username option to specify the username you want to use to the repository. Subversion remembers the last repository username and password used in each working copy, which means, among other things, that if yo...
SQL order string as number
...
and if you have mixed string and number and want them both sorted, use "order by col * 1, col"
– Hayden Thring
Feb 23 '15 at 3:42
...
How to append something to an array?
...to the length property. The interpreter does an amazing job at that itself and it will not make any difference in The Real World whether you optimize it away or not. If your array becomes so huge that optimizing .length would actually help, most probably an array is not the right data structure anym...
Valid values for android:fontFamily and what they map to?
In the answer to this question the user lists values for android:fontFamily and 12 variants (see below). Where do these values come from? The documentation for android:fontFamily does not list this information in any place (I checked here , and here ). The strings are listed in the Android ...
How to round a number to significant figures in Python
... You should use log10(abs(x)), otherwise negative numbers will fail (And treat x == 0 separately of course)
– Tobias Kienzler
Jul 30 '13 at 8:06
2
...