大约有 47,000 项符合查询结果（耗时：0.0614秒） [XML]
if A vs if A is not None:
...
@cedbeu, Seems to depend on the value of A. I tested now python -m timeit -s"a=0" "if a: pass" "else: pass" is faster than python -m timeit -s"a=0" "if a is None: pass" "else: pass" but python -m timeit -s"a=1" "if a: pass" "else: pass" is slower. Might be platform dependant, s...
What are the differences between Rust's `String` and `str`?
...of UTF-8 bytes of dynamic length somewhere in memory. Since the size is unknown, one can only handle it behind a pointer. This means that str most commonly2 appears as &str: a reference to some UTF-8 data, normally called a "string slice" or just a "slice". A slice is just a view onto some data,...
Can't resize UIView in IB
...ot exactly sure why this is, so would appreciate feedback from anyone who knows why exactly this is - there must be a good reason.
share
|
improve this answer
|
follow
...
How do I recover/resynchronise after someone pushes a rebase or a reset to a published branch?
... Quick note: I think it's pretty intuitive, but if you don't know awk well... that one-liner is just looking through the output of git reflog show origin/foo for the first line saying "fetch: forced-update"; that's what git records when a fetch causes the remote branch to do anything bu...
How to grep a text file which contains some binary data?
...binary files are treated differently:
When searching binary data, grep now may treat non-text bytes as line
terminators. This can boost performance significantly.
So what happens now is that with binary data, all non-text bytes
(including newlines) are treated as line terminators. If you wan...
How to create module-wide variables in Python? [duplicate]
...name.
Imagine a file called foo.py, containing this single line:
X = 1
Now imagine you import it.
import foo
print(foo.X) # prints 1
However, let's suppose you want to use one of your module-scope variables as a global inside a function, as in your example. Python's default is to assume tha...
How to auto-indent code in the Atom editor?
...untu's default shortcut for lock screen, I'm mapping with ctrl-shift-] for now.
– vusan
May 2 '16 at 11:51
|
show 5 more comments
...
iOS 7's blurred overlay effect using CSS?
...
I edited my jsfiddle, now it does the trick like IOS7 ;) => CSS3 IOS7 effect
– Cana
Jun 12 '13 at 8:55
...
MySQL vs MongoDB 1000 reads
..., with many indexes needed to ensure relational integrity between tables.
Now consider the same design with a document store. If all of those related tables are subordinate to the main table (and they often are), then you might be able to model the data such that the entire entity is stored in a si...
Vim: Delete buffer without losing the split window
...ch is so simple, not requiring and entire script to run it. In my VIMRC, I now have this mapped for CTRL+C: nnoremap <C-c> :bp\|bd #<CR>
– Cloud
Jul 12 '13 at 17:40
...