cls

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to writing a generic metaclass for tracking subclasses Since I want this to be generic, I didn't want to hardcode any class name within this metaclass, therefore I came up with a function that generates the proper metaclass, something like: def make_subtracker(root): class SubclassTracker(type): def __init__(cls, name, bases, dct): print('registering %s' % (name,)) root._registry.append(cls) super(SubclassTracker, cls).__init__(name, bases, dct) return SubclassTracker This way I could invoke it to generate a metaclass for a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I tried to extract the current epoch number while reading data using multiple cpu threads. However during a trial code I observed an output which did not make any sense. Consider the code below : with tf.Session() as sess: train_filename_queue = tf.train.string_input_producer(trainimgs, num_epochs=4, shuffle=True) value = train_filename_queue.dequeue() init_op = tf.group(tf.global_variables_initializer(), tf.local_variables_initializer()) sess.run(init_op) coord = tf.train.Coordinator() tf.train.start_queue_runners(coord=coord) collections =

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have a large amount of data in a collection in mongodb which I need to analyze. How do i import that data to pandas? I am new to pandas and numpy. EDIT: The mongodb collection contains sensor values tagged with date and time. The sensor values are of float datatype. Sample Data: { "_cls" : "SensorReport" , "_id" : ObjectId ( "515a963b78f6a035d9fa531b" ), "_types" : [ "SensorReport" ], "Readings" : [ { "a" : 0.958069536790466 , "_types" : [ "Reading" ], "ReadingUpdatedDate" : ISODate ( "2013-04-02T08:26:35.297Z" ), "b" : 6

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a Decimal('3.9') as part of an object, and wish to encode this to a JSON string which should look like {'x': 3.9} . I don't care about precision on the client side, so a float is fine. Is there a good way to serialize this? JSONDecoder doesn't accept Decimal objects, and converting to a float beforehand yields {'x': 3.8999999999999999} which is wrong, and will be a big waste of bandwidth. 回答1: How about subclassing json.JSONEncoder ? class DecimalEncoder(json.JSONEncoder): def _iterencode(self, o, markers=None): if isinstance(o,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Let's take a class called Cls : public class Cls { public int SequenceNumber { get ; set ; } public int Value { get ; set ; } } Now, let's populate some collection with following elements: Sequence Number Value ======== ===== 1 9 2 9 3 15 4 15 5 15 6 30 7 9 What I need to do, is to enumerate over Sequence Numbers and check if the next element has the same value. If yes, values are aggregated and so, desired output is as following: Sequence Sequence Number Number From To Value ======== ======== ===== 1 2 9 3 5 15 6 6 30 7 7 9 How

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I can't find a definitive answer for this. AFAIK, you can't have multiple __init__ functions in a Python class. So how do I solve this problem? Suppose I have an class called Cheese with the number_of_holes property. How can I have two ways of creating cheese-objects... one that takes a number of holes like this: parmesan = Cheese(num_holes = 15) and one that takes no arguments and just randomizes the number_of_holes property: gouda = Cheese() I can think of only one way to do this, but that seems kinda clunky: class Cheese(): def __init__

一：安装Pycharm https://www.cnblogs.com/huozf/p/9304396.html （有可取之处） https://www.jetbrains.com/idea/buy/#discounts?billing=yearly （学生注册，免费） 二：推文 https://www.cnblogs.com/ssyfj/p/11730362.html （含目录介绍） 三：源码分析流程 四：找入口函数main （一）我们编写的应用：全部继承于app_manager.RyuApp----去看他 from ryu.base import app_manager class Hub(app_manager.RyuApp): pass 没有找到主函数main!!!! （二）我们启动Ryu的常用方式 ryu-manager simple_switch_13.py --verbose 通过终端输入，启动Ryu控制器。因此我们进入cmd目录中 cmd目录定义了RYU的命令系统 我们在该文件目录下的两个文件中都找到了main函数-----Ok　　反正是找到了main函数 （三）使用Ctrl+B查找调用main函数的位置 1.ryu_base.py查找 在主目录下的bin目录的ryu文件中，调用了主函数main 2.在manager.py中查找 在主目录下的bin目录的ryu

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 选择语言 中文(简体) 日语 英语 中文(繁体) 由 翻译 强力驱动 问题: How can I display JSON in an easy-to-read (for human readers) format? I'm looking primarily for indentation and whitespace, with perhaps even colors / font-styles / etc. 回答1: Pretty-printing is implemented natively in JSON.stringify() . The third argument enables pretty printing and sets the spacing to use: var str = JSON.stringify(obj, null, 2); // spacing level = 2 If you need syntax highlighting, you might use some regex magic like so: function syntaxHighlight(json) { if (typeof json != 'string') { json

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Can any body please tell me what code is used for clear screen in Java? For example in C++ system("CLS"); What code is used in Java for clear screen? Thanks! 回答1: Since there are several answers here showing non-working code for Windows, here is a clarification: Runtime.getRuntime().exec("cls"); This command does not work, for two reasons: There is no executable named cls.exe or cls.com in a standard Windows installation that could be invoked via Runtime.exec , as the well-known command cls is builtin to Windows’ command line interpreter.

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've found a simply way to implement(hack) an enum into Python: class MyEnum: VAL1, VAL2, VAL3 = range(3) I can then call this as such: bob = MyEnum.VAL1 Sexy! Alright, now I want to be able to get both the numerical value if given a string, or a string if given a numerical value. Let's say I want the strings to exactly match up to the Enum key's The best I could think of is something like this: class MyEnum: VAL1, VAL2, VAL3 = range(3) @classmethod def tostring(cls, val): if (val == cls.VAL1): return "VAL1" elif (val == cls.VAL2): return