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Any reason not to use '+' to concatenate two strings?
...is is bad because the Python interpreter has to create a new string object for each iteration, and it ends up taking quadratic time. (Recent versions of CPython can apparently optimize this in some cases, but other implementations can't, so programmers are discouraged from relying on this.) ''.join...
Reload Flask app when template file changes
...th, walk
extra_dirs = ['directory/to/watch',]
extra_files = extra_dirs[:]
for extra_dir in extra_dirs:
for dirname, dirs, files in walk(extra_dir):
for filename in files:
filename = path.join(dirname, filename)
if path.isfile(filename):
extra_file...
How can I filter a date of a DateTimeField in Django?
...te operator. Check "#9596 Comparing a DateTimeField to a date is too hard" for more details.
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How to check iOS version?
...OS 9, *) {}
In Objective-C, you need to check the system version and perform a comparison.
[[NSProcessInfo processInfo] operatingSystemVersion] in iOS 8 and above.
As of Xcode 9:
if (@available(iOS 9, *)) {}
The full answer …
In Objective-C, and Swift in rare cases, it's better to avoid ...
C++及Windows异常处理(try，catch; __try,__finally, __except) - C/C++ - ...
...id f(const char* fn)
{
File_handle f(fn,"rw"); // open fn for reading and writing
// use file through f
}
在一个系统中，每一样资源都需要一个“资源局柄”对象，但我们不必为每一个资源都写一个“finally”语句。在实作的系...
What to put in a python module docstring? [closed]
... I've read both PEP 8 and PEP 257 , and I've written lots of docstrings for functions and classes, but I'm a little unsure about what should go in a module docstring. I figured, at a minimum, it should document the functions and classes that the module exports, but I've also seen a few modules t...
How to determine a Python variable's type?
...
You may be looking for the type() built-in function.
See the examples below, but there's no "unsigned" type in Python just like Java.
Positive integer:
>>> v = 10
>>> type(v)
<type 'int'>
Large positive integer:
&g...
Recommended way of making React component/div draggable
...it's state, and the draggable would "snap back" to it's initial position before dragging.
Mixin or component?
@ssorallen pointed out that, because "draggable" is more an attribute than a thing in itself, it might serve better as a mixin. My experience with mixins is limited, so I haven't seen how ...
Removing duplicate objects with Underscore for Javascript
...t {a=2}, Object {a=3}, Object {a=4}]
Notes:
Callback return value used for comparison
First comparison object with unique return value used as unique
underscorejs.org demonstrates no callback usage
lodash.com shows usage
Another example :
using the callback to extract car makes, colors from a...
Error in finding last used cell in Excel with VBA
...d hence I will keep on updating it whenever I come across a new scenario/information.
Unreliable ways of finding the last row
Some of the most common ways of finding last row which are highly unreliable and hence should never be used.
UsedRange
xlDown
CountA
UsedRange should NEVER be used to...