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Django. Override save for model
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You may supply extra argument for confirming a new image is posted.
Something like:
def save(self, new_image=False, *args, **kwargs):
if new_image:
small=rescale_image(self.image,width=100,height=100)
self.image_small=S...
Python: Get the first character of the first string in a list?
How would I get the first character from the first string in a list in Python?
4 Answers
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Calculate a MD5 hash from a string
I use the following C# code to calculate a MD5 hash from a string.
It works well and generates a 32-character hex string like this:
900150983cd24fb0d6963f7d28e17f72
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NSIS学习笔记（持续更新） - C/C++ - 清泛网 - 专注C/C++及内核技术
...and the stack.
void __declspec(dllexport) myFunction(HWND hwndParent, int string_size,
TCHAR *variables, stack_t **stacktop,
extra_parameters *extra)
{
g_hwndParent = hwndParent;
EXDLL_INIT();
//读取输入参数
WCHAR szComponent[256];
popstring(szComponent);
//打印参...
In .NET, which loop runs faster, 'for' or 'foreach'?
...tably faster, why shouldn't you start using it in general? It doesn't take extra time.
– DevinB
Sep 3 '09 at 13:06
50
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General guidelines to avoid memory leaks in C++ [closed]
...e heap internally (note the double negation... :-) ...). For example, std::string implemented with Small String Optimization will have a buffer "on the stack of the class" for small strings (~15 chars), and will use a pointer to a memory in the heap for larger strings... But from the outside, std::s...
In-memory size of a Python structure
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@AlexMartelli Hi Alex! .. Why minimum size of a char in python is 25 bytes. >>> getsizeof('a') gives 25 and >>> getsizeof('ab') gives 26 `
– Grijesh Chauhan
Jan 17 '13 at 5:13
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How to document class attributes in Python? [closed]
...stantiations. There's no provision in the Python language for creating docstrings for class attributes, or any sort of attributes, for that matter. What is the expected and supported way, should there be one, to document these attributes? Currently I'm doing this sort of thing:
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Hidden features of C
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Multi-character constants:
int x = 'ABCD';
This sets x to 0x41424344 (or 0x44434241, depending on architecture).
EDIT: This technique is not portable, especially if you serialize the int.
However, it can be extremely useful to ...
How can I read SMS messages from the device programmatically in Android?
...tent://sms/inbox") to read SMS which are in inbox.
// public static final String INBOX = "content://sms/inbox";
// public static final String SENT = "content://sms/sent";
// public static final String DRAFT = "content://sms/draft";
Cursor cursor = getContentResolver().query(Uri.parse("content://sms...