大约有 30,000 项符合查询结果（耗时：0.0246秒） [XML]
Can Python test the membership of multiple values in a list?
...
True
>>> {'a', 'b'} <= {'a', 'b', 'foo', 'bar'}
True
...sometimes:
>>> {'a', ['b']} <= {'a', ['b'], 'foo', 'bar'}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
Sets can only be created with hashab...
Is it possible dynamically to add String to String.xml in Android?
...olders in string values in string.xml that can be assigned values at run time?
13 Answers
...
List comprehension vs map
...y speed advantage of map when using exactly the same function:
$ python -mtimeit -s'xs=range(10)' 'map(hex, xs)'
100000 loops, best of 3: 4.86 usec per loop
$ python -mtimeit -s'xs=range(10)' '[hex(x) for x in xs]'
100000 loops, best of 3: 5.58 usec per loop
An example of how performance comparis...
Printing Java Collections Nicely (toString Doesn't Return Pretty Output)
...
@Boosha it also takes O(n) time to convert the stack to a string and O(n) time to print the string to the console
– Zach Langley
May 29 '15 at 15:27
...
TransactionScope automatically escalating to MSDTC on some machines?
...cope without escalating, provided the connections are not open at the same time, which would result in multiple "physical" TCP connections and thus require escalation.
I see some of your developers have SQL Server 2005 and others have SQL Server 2008. Are you sure you have correctly identified whic...
How to convert comma-separated String to List?
... (regex). \s matches any white space, The * applies the match zero or more times. So \s* means "match any white space zero or more times". We look for this before and after the comma. Therefore, the split will work for strings like "item1 , item2 , item3", or "item1,item2 ,item3", etc. In Java, you ...
How should I log while using multiprocessing in Python?
... file descriptor (to disk or to pipe.) Ideally, all log entries should be timestamped.
Your controller process can then do one of the following:
If using disk files: Coalesce the log files at the end of the run, sorted by timestamp
If using pipes (recommended): Coalesce log entries on-the-fly f...
How to reuse an ostringstream?
...and then has to write the string built in the ostringstream somewhere from time to time (e.g. after a certain character sequence was read) and start building a new string.
– Andre Holzner
Jan 31 '12 at 15:09
...
What is the difference between char s[] and char *s?
... In both declaration for "hello" memory is allocated at comiple time ?.And another thing char *p = "hello" here "hello" is stored in text segment as you stated in your answer...and what about char s[] = "hello" will it also store first in text segment part and during run time it will copy...
JavaScript equivalent to printf/String.Format
...uld use template strings:
let soMany = 10;
console.log(`This is ${soMany} times easier!`);
// "This is 10 times easier!
See Kim's answer below for details.
Otherwise:
Try sprintf() for JavaScript.
If you really want to do a simple format method on your own, don’t do the replacements suc...