大约有 5,000 项符合查询结果（耗时：0.0138秒） [XML]
How to diff a commit with its parent?
...).
Note: the description in git-rev-parse(1) manpage talks about revision ranges, where it needs to work also for merge commits, with more than one parent. Then r1^! is "r1 --not r1^@" i.e. "r1 ^r1^1 ^r1^2 ..."
Also, you can use git show COMMIT to get commit description and diff for a commit. If...
Find all records which have a count of an association greater than zero
...roject_id = projects.id").arel.exists)
Edit: if you're uncomfortable with raw SQL, try:
Project.where.not(Vacancies.where(Vacancy.arel_table[:project_id].eq(Project.arel_table[:id])).arel.exists)
You can make this less messy by adding class methods to hide the use of arel_table, for example:
class...
How Big can a Python List Get?
...
Sure it is OK. Actually you can see for yourself easily:
l = range(12000)
l = sorted(l, reverse=True)
Running the those lines on my machine took:
real 0m0.036s
user 0m0.024s
sys 0m0.004s
But sure as everyone else said. The larger the array the slower the operations will be....
What is simplest way to read a file into String? [duplicate]
...eam as a String
List readLines(InputStream, String encoding)
... as a (raw) List of String, one entry per line
Related questions
Most useful free third party Java libraries (deleted)?
share
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...
How to print a dictionary's key?
...n x.items()))
# To print all pairs of (key, value) one at a time
for e in range(len(x)):
print(([key for key in x.keys()][e], [value for value in x.values()][e]))
# To print all pairs (key, value) in a tuple
print(tuple(([key for key in x.keys()][i], [value for value in x.values()][i]) for i i...
How to make a new List in Java
...= new ArrayList<String>();
And follow best practices...
Don't use raw types
Since Java 5, generics have been a part of the language - you should use them:
List<String> list = new ArrayList<>(); // Good, List of String
List list = new ArrayList(); // Bad, don't do that!
Prog...
What is the purpose of a question mark after a type (for example: int? myVariable)?
...of the System.Nullable struct. A
nullable type can represent the correct range of values for its
underlying value type, plus an additional null value. For example, a
Nullable<Int32>, pronounced "Nullable of Int32," can be assigned any
value from -2147483648 to 2147483647, or it can be ...
What would cause an algorithm to have O(log n) complexity?
...
Also note that this is the most concise way to denote the number in this range. Any reduction will lead to information loss, as a missing digit can be mapped to 10 other numbers. For example: 12* can be mapped to 120, 121, 122, …, 129.
2. How do you search for a number in (0, N - 1)?
Taking N ...
Streaming video from Android camera to server
...droid phone to IP camera:
http://code.google.com/p/ipcamera-for-android
Raw video data is fetched from LocalSocket, and the MDAT MOOV of MP4 was checked first before streaming. The live video is packed in FLV format, and can be played via Flash video player with a build in web server :)
...
Check if something is (not) in a list in Python
...your element is at the start of the list, in evaluates faster:
lst = list(range(10001))
%timeit 1 in lst
%timeit 10000 in lst # Expected to take longer time.
68.9 ns ± 0.613 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
178 µs ± 5.01 µs per loop (mean ± std. dev. of 7 runs, ...