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How to tell which version of a gem a rails app is using
...
173
In Rails 3 and Rails 4, use bundle show
In Rails 2, rake gems will print out what gems, depende...
Python: List vs Dict for look up table
...M. Kuchling in Beautiful Code, the implementation tries to keep the hash 2/3 full, so you might waste quite some memory.
If you do not add new entries on the fly (which you do, based on your updated question), it might be worthwhile to sort the list and use binary search. This is O(log n), and is ...
__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...nt(const char *format,...) __attribute__((format(printf,1,2)));
//m=2；n=3
extern void myprint(int l，const char *format,...)
__attribute__((format(printf,2,3)));
需要特别注意的是，如果myprint是一个函数的成员函数，那么m和n的值可有点“悬乎”了，例如：
//...
How to print to console in pytest?
...est-2.5.2
plugins: cache, cov, pep8, xdist
collected 2 items
tmp.py 0
1
2
3
... and so on ...
997
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999
.this should fail!
F
=================================== FAILURES ===================================
___________________________________ test_bad ___________________________________
def ...
Multiple Type Constraints in Swift
...e T:SomeProtocol, T:SomeOtherProtocol>(arg: T) {
// stuff
}
Swift 3 & 4:
func someFunc<T: SomeProtocol & SomeOtherProtocol>(arg: T) {
// stuff
}
or the more powerful where clause:
func someFunc<T>(arg: T) where T:SomeProtocol, T:SomeOtherProtocol{
// stuff
}
...
What are the special dollar sign shell variables?
...
1398
$1, $2, $3, ... are the positional parameters.
"$@" is an array-like construct of all positio...
rspec 3 - stub a class method
I am upgrading from rspec 2.99 to rspec 3.0.3 and have converted instance methods to use allow_any_instance_of , but haven't figured out how to stub a class method. I have code like this:
...
Convert a list to a dictionary in Python
....
from itertools import izip
i = iter(a)
b = dict(izip(i, i))
In Python 3 you could also use a dict comprehension, but ironically I think the simplest way to do it will be with range() and len(), which would normally be a code smell.
b = {a[i]: a[i+1] for i in range(0, len(a), 2)}
So the iter(...
Change select box option background color
... tag...
select option {
margin: 40px;
background: rgba(0, 0, 0, 0.3);
color: #fff;
text-shadow: 0 1px 0 rgba(0, 0, 0, 0.4);
}
If you want to style each one of the option tags.. use the css attribute selector:
select option {
margin: 40px;
background: rgba(0, 0, 0, 0.3);...