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“Inner exception” (with traceback) in Python?
...to catch and change your exception on the fly:
(see http://docs.python.org/3.1/library/stdtypes.html for expanation of how they work)
try: # Wrap the whole program into the block that will kill __context__.
class Catcher(Exception):
'''This context manager reraises an exception und...
How to set ViewBag properties for all Views without using a base class for Controllers?
...how you how to use it in .Net Core and .Net Framework.
.Net Core 2.1 & 3.1
public class ViewBagActionFilter : ActionFilterAttribute
{
public override void OnResultExecuting(ResultExecutingContext context)
{
// for razor pages
if (context.Controller is PageModel)
{...
How to open a file using the open with statement
...introduced, or in Python 2.6, but it is supported in Python 2.7 and Python 3.1 or newer.
http://docs.python.org/reference/compound_stmts.html#the-with-statement
http://docs.python.org/release/3.1/reference/compound_stmts.html#the-with-statement
If you are writing code that must run in Python 2.5, ...
NASM x86汇编入门指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
...么写这篇文章
3. NASM(The Netwide Assembler)汇编编译工具
3.1 为什么使用NASM？
3.2 如何安装NASM？
4. Linux汇编介绍
4.1 DOS和Linux汇编主要不同的地方
4.2 一个汇编程序的组成
4.3 linux系统调用
4.3.1 阅读参考手...
How to get the IP address of the docker host from inside a docker container
...p://dl-cdn.alpinelinux.org/alpine/v3.3/community/x86_64/APKINDEX.tar.gz
v3.3.1-119-gb247c0a [http://dl-cdn.alpinelinux.org/alpine/v3.3/main]
v3.3.1-59-g48b0368 [http://dl-cdn.alpinelinux.org/alpine/v3.3/community]
OK: 5855 distinct packages available
(1/4) Installing openssl (1.0.2g-r0)
(2/4) Instal...
Truncating floats in Python
...
return '.'.join([i, (d+'0'*n)[:n]])
This is valid in Python 2.7 and 3.1+. For older versions, it's not possible to get the same "intelligent rounding" effect (at least, not without a lot of complicated code), but rounding to 12 decimal places before truncation will work much of the time:
def...
iOS UIImagePickerController result image orientation after upload
I am testing my iPhone application on an iOS 3.1.3 iPhone. I am selecting/capturing an image using a UIImagePickerController :
...
Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
...
Behavior differences
Some differences on Bash 4.3.11:
POSIX vs Bash extension:
[ is POSIX
[[ is a Bash extension¹
regular command vs magic
[ is just a regular command with a weird name.
] is just an argument of [ that prevents further arguments from being used.
U...
Paperclip::Errors::MissingRequiredValidatorError with Rails 4
...
I couldn't get any of these solutions to work either. I tried Paperclip 3.1, but couldn't then my app kept telling me my image file extensions weren't approved, even though they were jpg.
I finally found success with version 3.5.1.
...
UnboundLocalError on local variable when reassigned after first use
...
Here are two links that may help
1: docs.python.org/3.1/faq/programming.html?highlight=nonlocal#why-am-i-getting-an-unboundlocalerror-when-the-variable-has-a-value
2: docs.python.org/3.1/faq/programming.html?highlight=nonlocal#how-do-i-write-a-function-with-output-parameters-...