大约有 48,000 项符合查询结果（耗时：0.0546秒） [XML]
Resolve absolute path from relative path and/or file name
...batch script to return an absolute path from a value containing a filename and/or relative path?
14 Answers
...
How to write inline if statement for print?
...n Python 2.5)
expression_if_true if condition else expression_if_false
And note, that both print a and b = a are statements. Only the a part is an expression. So if you write
print a if b else 0
it means
print (a if b else 0)
and similarly when you write
x = a if b else 0
it means
x = ...
Purge or recreate a Ruby on Rails database
...ave a dev Ruby on Rails database full of data. I want to delete everything and rebuild the database. I'm thinking of using something like:
...
Are loops really faster in reverse?
...
is it worth to introduce a variable for array.length and use it in the for loop's head?
– ragatskynet
Oct 30 '12 at 10:13
39
...
Rails find_or_create_by more than one attribute?
There is a handy dynamic attribute in active-record called find_or_create_by:
5 Answers
...
How accurately should I store latitude and longitude?
...
Actually, equator is best case. One latitude and one longitude degree are the same size at the equator (69 miles), but one degree of longitude shrinks to zero as it approaches either of the poles. Here's a very nice explanation: nationalatlas.gov/articles/mapping/a_latl...
What is the difference in maven between dependency and plugin tags in pom xml?
I'm new to the maven tool, I have made a project with Spring and Hibernate and they are configured in pom.xml as plugins, but JUnit is tagged under dependency. My question is what is the logic behind one as a plugin and one as dependency ?
...
What is the difference between & and && in Java?
...& operator in Java is used for verifying whether both its boolean operands are true , and the & operator is used to do Bit-wise operations on two integer types.
...
Javascript Drag and drop for touch devices [closed]
...
You can use the Jquery UI for drag and drop with an additional library that translates mouse events into touch which is what you need, the library I recommend is https://github.com/furf/jquery-ui-touch-punch, with this your drag and drop from Jquery UI should ...
Change column type from string to float in Pandas
I want to convert a table, represented as a list of lists, into a Pandas DataFrame . As an extremely simplified example:
9...