大约有 45,000 项符合查询结果（耗时：0.0421秒） [XML]
Why use apparently meaningless do-while and if-else statements in macros?
...say you
had something like your second macro.
#define BAR(X) f(x); g(x)
Now if you were to use BAR(X); in an if ... else statement, where the bodies of the if statement were not wrapped in curly brackets, you'd get a bad surprise.
if (corge)
BAR(corge);
else
gralt();
The above code would e...
Flattening a shallow list in Python [duplicate]
...s is the only answer I've seen that's made the ordering explicit... Maybe now I can remember it!
– Izkata
Mar 20 '12 at 15:47
10
...
What is an undefined reference/unresolved external symbol error and how do I fix it?
...ompiled a bunch of implementation files into object files or libraries and now you want to get them to work together.
Say you defined symbol a in a.cpp. Now, b.cpp declared that symbol and used it. Before linking, it simply assumes that that symbol was defined somewhere, but it doesn't yet care wher...
libpthread.so.0: error adding symbols: DSO missing from command line
...
In part solved adding '-lpthread', but now it shows me: gaSim.c:(.text+0x11d6): undefined reference to `glewInit'
– Aerox
Jun 26 '14 at 8:53
1...
In Python, how do I read the exif data for an image?
...
For Python3.x and starting Pillow==6.0.0, Image objects now provide a getexif() method that returns <class 'PIL.Image.Exif'> or None if the image has no EXIF data.
From Pillow 6.0.0 release notes:
getexif() has been added, which returns an Exif instance. Values can
be retri...
Python module for converting PDF to text [closed]
...ith the -layout option to keep text in the same position as is in the PDF. Now if only I could figure out how to pipe the contents of a PDF into it.
– Matthew Schinckel
May 31 '12 at 6:00
...
Sibling package imports
...nstall will work still work fine. See an example below.
Test the solution
Now, let's test the solution using api.py defined above, and test_one.py defined below.
test_one.py
from myproject.api.api import function_from_api
def test_function():
print(function_from_api())
if __name__ == '__main_...
What does enumerate() mean?
...by Brett Slatkin and he shows another way to iterate over a list and also know the index of the current item in the list but he suggests that it is better not to use it and to use enumerate instead.
I know you asked what enumerate means, but when I understood the following, I also understood how en...
How to write inline if statement for print?
...ilarly when you write
x = a if b else 0
it means
x = (a if b else 0)
Now what would it print/assign if there was no else clause? The print/assignment is still there.
And note, that if you don't want it to be there, you can always write the regular if statement on a single line, though it's le...
Random String Generator Returning Same String [duplicate]
...ething like this:
private static Random random = new Random((int)DateTime.Now.Ticks);//thanks to McAden
private string RandomString(int size)
{
StringBuilder builder = new StringBuilder();
char ch;
for (int i = 0; i < size; i++)
{
ch = Convert.ToCh...