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C#对象序列化与反序列化 - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
...效时尤其有用，但是需要为变量提供值以重建对象的完整状态。要实现ISerializable，需要实现 GetObjectData()方法以及一个特殊的构造函数，在反序列化对象时要用到此构造函数。
(2)示例程序
[Serializable]
public class Person : ISerializab...
一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术
...一笔交易的付款人、收款人和付款金额。只要账簿的初始状态确定，每一笔交易记录可靠并有时序，当前每个人持有多少钱是可以推算出来的。
账簿由私有改为公开，只要任何村民需要，都可以获得当前完整的账簿，账簿上记...
地图组件（高德地图） · App Inventor 2 中文网
...错误时，将触发该事件。
响应代码 参数将包含 HTTP 状态代码，而 错误信息 参数将包含详细的错误消息。
位置点被长按(纬度,经度)
当用户长按地图上的某个点而不移动手指时，就会触发该事件。（移动手指将触发拖动...
Build an ASCII chart of the most commonly used words in a given text [closed]
...$<.read.downcase.scan(/[a-z]+/)-%w{the and of to a i it in or is}).group_by{|x|x}.map{|x,y|[-y.size,x]}.sort[0,22]
k,l=w[0]
puts [?\s+?_*m=76-l.size,w.map{|f,x|?|+?_*(f*m/k)+"| "+x}]
Instead of using any command line switches like the other solutions, you can simply pass the filename as argumen...
Cooler ASCII Spinners? [closed]
... even in random order http://www.fileformat.info/info/unicode/block/braille_patterns/images.htm
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Why does the C preprocessor interpret the word “linux” as the constant “1”?
...whether it's being compiled for a Linux target or not it can check whether __linux__ is defined (assuming you're using gcc or a compiler that's compatible with it). See the GNU C preprocessor manual for more information.
A largely irrelevant aside: the "Best One Liner" winner of the 1987 Internatio...
How to properly assert that an exception gets raised in pytest?
...
pytest.raises(Exception) is what you need.
Code
import pytest
def test_passes():
with pytest.raises(Exception) as e_info:
x = 1 / 0
def test_passes_without_info():
with pytest.raises(Exception):
x = 1 / 0
def test_fails():
with pytest.raises(Exception) as e_info:
...
Should I implement __ne__ in terms of __eq__ in Python?
I have a class where I want to override the __eq__ method. It seems to make sense that I should override the __ne__ method as well, but does it make sense to implement __ne__ in terms of __eq__ as such?
...
filename and line number of python script
...
Whether you use currentframe().f_back depends on whether you are using a
function or not.
Calling inspect directly:
from inspect import currentframe, getframeinfo
cf = currentframe()
filename = getframeinfo(cf).filename
print "This is line 5, python say...
C++ preprocessor __VA_ARGS__ number of arguments
...re however you have a macro implementation that does the count:
#define PP_NARG(...) \
PP_NARG_(__VA_ARGS__,PP_RSEQ_N())
#define PP_NARG_(...) \
PP_ARG_N(__VA_ARGS__)
#define PP_ARG_N( \
_1, _2, _3, _4, _5, _6, _7, _8, _9,_10, \
_11,_12,_13,_14,_15,_16,_17,_18,_...