大约有 19,000 项符合查询结果（耗时：0.0245秒） [XML]
Get the Highlighted/Selected text
...de an editable element containing one or more elements (such as images and form controls) with outlines and resize handles. If you call .createRange() on such a selection, you get a ControlRange rather than a TextRange, and ControlRanges have no text property.
– Tim Down
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QString to char* conversion
...rmally live until the end of the statement that creates them. So the first form in the answer is ok if it's used in-line in a function call (assuming the function doesn't store the pointer for future use) but it's not ok if it's assigned to a variable.
– plugwash
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Find out time it took for a python script to complete execution
... Last line should probably read print('It took {0:0.1f} seconds'.format(time.time() - start)) in python 3.x.
– Chris Mueller
Feb 3 '16 at 19:24
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Illegal pattern character 'T' when parsing a date string to java.util.Date
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Update for Java 8 and higher
You can now simply do Instant.parse("2015-04-28T14:23:38.521Z") and get the correct thing now, especially since you should be using Instant instead of the broken java.util.Date with the most recent versions of Java.
You should be using DateTimeFormatter instead...
How to create composite primary key in SQL Server 2008
... Not quite true. Both create "named constraints". It's just that with the former, you don't control the naming. But once created, you can look up the name that was used and delete/update by name...
– Auspex
Jul 3 '17 at 15:53
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.NET - Get protocol, host, and port
...ice I want and don't have to worry about whether or not the string is well formed enough to get the port. +1
– Jrud
Nov 2 '11 at 14:37
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Command not found error in Bash variable assignment
...s.opengroup.org/onlinepubs/9699919799 "If all the characters preceding '=' form a valid name (see XBD Name), the token ASSIGNMENT_WORD shall be returned." Following the link to section 3.231 of pubs.opengroup.org/onlinepubs/9699919799, we find "In the shell command language, a word consisting solel...
How can Perl's print add a newline by default?
In Perl most of my print statements take the form
8 Answers
8
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Bash tool to get nth line from a file
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sed -n '2p' < file.txt
will print 2nd line
sed -n '2011p' < file.txt
2011th line
sed -n '10,33p' < file.txt
line 10 up to line 33
sed -n '1p;3p' < file.txt
1st and 3th line
and so on...
For adding lines with sed, you can check this:
sed: insert a line in a ...
Convert base-2 binary number string to int
...b.int
-1
The bitstring module isn't a requirement, but it has lots of performant methods for turning input into and from bits into other forms, as well as manipulating them.
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