大约有 47,000 项符合查询结果（耗时：0.0348秒） [XML]
enum - getting value of enum on string conversion
...;>> member.name
'red'
>>> member.value
1
You could add a __str__ method to your enum, if all you wanted was to provide a custom string representation:
class D(Enum):
def __str__(self):
return str(self.value)
x = 1
y = 2
Demo:
>>> from enum import E...
Macro vs Function in C
... int numButtons;
};
struct webpage
{
int numButtons;
};
#define num_button_holes(shirt) ((shirt).numButtons * 4)
struct webpage page;
page.numButtons = 2;
num_button_holes(page) -> 8
Finally, macros can be difficult to debug, producing weird syntax errors or runtime errors that you ha...
Try catch statements in C
...ou can simulate them to a degree with setjmp and longjmp calls.
static jmp_buf s_jumpBuffer;
void Example() {
if (setjmp(s_jumpBuffer)) {
// The longjmp was executed and returned control here
printf("Exception happened here\n");
} else {
// Normal code execution starts here
Te...
搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...安装程序包
wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.8.tgz
#解压下载的压缩包
tar xvzf mongodb-linux-x86_64-2.4.8.tgz
4、分别在每台机器建立mongos 、config 、 shard1 、shard2、shard3 五个目录。
因为mongos不存储数据，只需要建立...
fs: how do I locate a parent folder?
...
Try this:
fs.readFile(__dirname + '/../../foo.bar');
Note the forward slash at the beginning of the relative path.
share
|
improve this answer
...
How do I log a Python error with debug information?
...
The exception method simply calls error(message, exc_info=1). As soon as you pass exc_info to any of the logging methods from an exception context, you will get a traceback.
– Helmut Grohne
Jun 25 '13 at 18:46
...
C# operator overload for `+=`?
...;
Console.WriteLine(d);
Let view the IL-code for this instructions:
IL_0000: nop
IL_0001: ldc.i4.s 10
IL_0003: newobj instance void [mscorlib]System.Decimal::.ctor(int32)
IL_0008: stloc.0
IL_0009: ldloc.0
IL_000a: ldc.i4.s 10
IL_000c: newobj instance void [mscorli...
Python argparse: Make at least one argument required
...
args = vars(parser.parse_args())
if not any(args.values()):
parser.error('No arguments provided.')
share
|
improve this answer
|
...
What is the fastest way to check if a class has a function defined?
...tr() to get the attribute, and callable() to verify it is a method:
invert_op = getattr(self, "invert_op", None)
if callable(invert_op):
invert_op(self.path.parent_op)
Note that getattr() normally throws exception when the attribute doesn't exist. However, if you specify a default value (None...
How do I test an AngularJS service with Jasmine?
...hat passed
// for logging? Let's make it String-readable...
function _parseStuffIntoMessage(stuff) {
var message = "";
if (typeof stuff !== "string") {
message = JSON.stringify(stuff)
} else {
message = stuff;
}
return message;
}
/**
* @summary
* Wri...