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Concatenating two lists - difference between '+=' and extend()
...E_ADD.
It's really nothing you should be worrying about, unless you're performing this operation billions of times. It is likely, however, that the bottleneck would lie some place else.
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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...
Is bool a native C type?
...ed). ANSI, as usual, has adopted the ISO C11 standard as an ANSI standard. For historical reasons, the phrase "ANSI C" commonly (but incorrecetly) refers to the language defined by the ANSI C89 / ISO C90 standard. Since C standards are now published by ISO first, and since there have been three ISO ...
How to avoid having class data shared among instances?
...ide every new instance of the object, which is the behavior you're looking for.
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How do I convert between big-endian and little-endian values in C++?
... do the following: You include intrin.h and call the following functions:
For 16 bit numbers:
unsigned short _byteswap_ushort(unsigned short value);
For 32 bit numbers:
unsigned long _byteswap_ulong(unsigned long value);
For 64 bit numbers:
unsigned __int64 _byteswap_uint64(unsigned __int64 ...
How to write inline if statement for print?
...ec If Python doesn't have a trailing if, then why does this work: print [i for i in range(10) if i%2]? I wish they'd allow it outside of comprehensions...
– mbomb007
Sep 26 '15 at 22:13
...
Traverse a list in reverse order in Python
... reversed() function:
>>> a = ["foo", "bar", "baz"]
>>> for i in reversed(a):
... print(i)
...
baz
bar
foo
To also access the original index, use enumerate() on your list before passing it to reversed():
>>> for i, e in reversed(list(enumerate(a))):
... print(...
How to make a variadic macro (variable number of arguments)
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I don't think C99 requires the ## before VA_ARGS. That might just be VC++.
– Chris Lutz
Mar 25 '09 at 2:18
98
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How to parse/read a YAML file into a Python object? [duplicate]
...
If your YAML file looks like this:
# tree format
treeroot:
branch1:
name: Node 1
branch1-1:
name: Node 1-1
branch2:
name: Node 2
branch2-1:
name: Node 2-1
And you've installed PyYAML like this:
pip in...
When I catch an exception, how do I get the type, file, and line number?
...
Simplest form that worked for me.
import traceback
try:
print(4/0)
except ZeroDivisionError:
print(traceback.format_exc())
Output
Traceback (most recent call last):
File "/path/to/file.py", line 51, in <module>
...