大约有 40,000 项符合查询结果（耗时：0.0510秒） [XML]
Error: Jump to case label
...code, if foo equals 1, everything is ok, but if it equals 2, we'll accidentally use the i variable which does exist but probably contains garbage.
switch(foo) {
case 1:
int i = 42; // i exists all the way to the end of the switch
dostuff(i);
break;
case 2:
dostuff(i*2); // i is ...
What is the printf format specifier for bool?
...sing a single char * to printf() is considered bad practice because it's really supposed to be a format string, and an unescaped percent sign might cause your program to blow up (see here for more). Thus, printf("%s", ...) is safer. If you're not doing any actual formatting to begin with, the printf...
setuptools: package data folder location
...or example, if I have a project layout like so:
project/
foo/
__init__.py
data/
resource1/
foo.txt
You can add a function to __init__.py to locate an absolute path to a data
file:
import os
_ROOT = os.path.abspath(os.path.dirname(__file__))
def g...
Repeat each row of data.frame the number of times specified in a column
...! I always forget you can use square brackets that way. I keep thinking of indexing just for subsetting or reordering. I had another solution that is far less elegant and no doubt less efficient. I might post anyway so that others can compare.
– wkmor1
May 24 '...
How exactly do Django content types work?
...ce usage example. I have 2 suggestions for you:
1: examine this code
def index(request):
media_type='text/html'
if request.META.has_key('CONTENT_TYPE'):
media_type = request.META['CONTENT_TYPE'].split(';')[0]
if media_type.lower() == 'application/json':
return HttpResponse(""...
How does zip(*[iter(s)]*n) work in Python?
... each element is x. *arg unpacks a sequence into arguments for a function call. Therefore you're passing the same iterator 3 times to zip(), and it pulls an item from the iterator each time.
x = iter([1,2,3,4,5,6,7,8,9])
print zip(x, x, x)
...
Mocking a class: Mock() or patch()?
...ake a look at this snippet:
>>> class MyClass(object):
... def __init__(self):
... print 'Created MyClass@{0}'.format(id(self))
...
>>> def create_instance():
... return MyClass()
...
>>> x = create_instance()
Created MyClass@4299548304
>>>
>>>...
How to calculate age (in years) based on Date of Birth and getDate()
...ated method does not have the issue with leap years, I'd suggest (if you really want to keep it at all) to move it down the bottom of your answer.
– ajbeaven
Jul 4 '17 at 23:14
1
...
Dynamic cell width of UICollectionView depending on label width
...
You cannot imagine how I thank you! That really works. Now I only need to resolve [cell.myLabel sizeToFit] problem, because it appears in its full size only after scrolling. But I have not been even close to your solution.
– pulp
...
Detect blocked popup in Chrome
...code I use for cross-browser detection, without the Chrome part.
function _hasPopupBlocker(poppedWindow) {
var result = false;
try {
if (typeof poppedWindow == 'undefined') {
// Safari with popup blocker... leaves the popup window handle undefined
result = t...