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How to import classes defined in __init__.py
... in sys.path.
Your 'lib/__init__.py' might look like this:
from . import settings # or just 'import settings' on old Python versions
class Helper(object):
pass
Then the following example should work:
from lib.settings import Values
from lib import Helper
Answer to the edited version of...
Append an object to a list in R in amortized constant time, O(1)?
...edly add an element to a list. With normal list concatenation
# or element setting this would lead to a large number of memory copies and a
# quadratic runtime. To prevent that, this function implements a bare bones
# expanding array, in which list appends are (amortized) constant time.
expandin...
Selecting the first “n” items with jQuery
...uch cleaner, using slice is much more efficient if you have a large result set to start with. Unfortunately, when evaluating ":lt" and other positional selectors, jQuery loops through the entire set, even if it's just getting the first element. I've written more about this on my blog here: spadgos.c...
How to generate all permutations of a list?
...None else r
for indices in product(range(n), repeat=r):
if len(set(indices)) == r:
yield tuple(pool[i] for i in indices)
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bat 写注册表详解 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
bat 写注册表详解实例：reg add "HKCU Software Microsoft Windows CurrentVersion Run" v "test" d "c: windows system32 regedit" f命令提示符...实例：
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "test" /d "c:\windows\system32\regedit" /f
命令提示符 r...
Bare asterisk in function arguments?
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
...
How do I check if a string is a number (float)?
What is the best possible way to check if a string can be represented as a number in Python?
33 Answers
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Easily measure elapsed time
I am trying to use time() to measure various points of my program.
26 Answers
26
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Equivalent of strace -feopen < command > on mac os X
...ss command shortly. Thanks for the quick response!
– Setjmp
Dec 18 '09 at 6:43
2
Somehow, today, ...
Why doesn't 'ref' and 'out' support polymorphism?
... it, right? You write a Tiger to a variable of type Animal and you're all set, right?
Wrong. The rule is not "N can only write to n".
The rules are, briefly:
1) N has to write to n before N returns normally. (If N throws, all bets are off.)
2) N has to write something to n before it reads so...