nested

问题 From the following json, in python, I'd like to extract the value "TEXT". All the keys are constant except for unknown. Unknown could be any string like "a6784t66" or "hobvp*nfe". The value of unknown is not known , only that it will be in that position in each json response. { "A": { "B": { "unknown": { "1": "F", "maindata": [ { "Info": "TEXT" } ] } } } } one line json '{"A":{"B":{"unknown":{"1":"F","maindata":[{"Info":"TEXT"}]}}}}' How would you get the value of "Text"? (I know how to load

问题 The following nested for-loop drives me mad (on Windows 7): @echo off SetLocal EnableDelayedExpansion set TESTDIRS=fast mid slow set TD=src\test\resources\testsuite for %%d in (%TESTDIRS%) do ( set CTD=%TD%\%%d echo CTD: !CTD! REM Echos the expected path echo CTD: %CTD% REM Echos nothing -- understandable for /R !CTD! %%f in (*.fs) do (echo %%f) REM Echos nothing -- why? for /R src\test\resources\testsuite\fast %%f in (*.fs) do (echo %%f) REM Echos expected files ) I tried various solutions

问题 This question already has answers here : How to get paginated/sliced data of subdocument array in mongo collection? (2 answers) Closed 2 years ago . I have array of parent documents consisting of nested documents ranging between 20 to 500. How can I limit the number of nested documents shown for each parent document. below is the structure of my Document and nested document. [{ id title users: [{ user_id: 1, timestamp: 2354218, field3: 4 }, { user_id: 1, timestamp: 2354218, field3: 4 }, {

问题 I have two gridviews - one nested in the other - and I am trying to set the datasource of the child grid programmaticly, but am not sure how to reference it. <telerik:RadGrid ID="RadGridResults" runat="server" AutoGenerateColumns="true" OnNeedDataSource="RadGridResults_NeedDataSource"> <MasterTableView> <NestedViewTemplate> <telerik:RadGrid ID="RadGridDetails" runat="server" AutoGenerateColumns="true"> </telerik:RadGrid> </NestedViewTemplate> </MasterTableView> </telerik:RadGrid> I have tried

问题 Using the example def foo(a): def bar(b): return a+b return bar d = {1:foo(1), 2:foo(2)} It appears that pickle module will not work with a function not defined at the module scope, so pickling 'd' will not work. Is there another pickling mechanism available that I should consider? 回答1: I'm afraid that you can't pickle nested functions. The pickle module serializes functions by name. That is, if you have a function myfunc in a module mymodule it simply saves the name mymodule.myfunc and looks

问题 I am kind of new to promises and are stuck on the following exercise. I have an array of values and I want to execute an async call on each one. In the callback, I want to execute another call on the outcome of the first call. Basically, my frustration is in the following: The order of execution should be '1x2x3x' but the order is '123xxx' In other words, the loop is already going to the next iteration when the sub/nested promise of the first promise is not fullfilled yet.. var values = ["1",

问题 I am kind of new to promises and are stuck on the following exercise. I have an array of values and I want to execute an async call on each one. In the callback, I want to execute another call on the outcome of the first call. Basically, my frustration is in the following: The order of execution should be '1x2x3x' but the order is '123xxx' In other words, the loop is already going to the next iteration when the sub/nested promise of the first promise is not fullfilled yet.. var values = ["1",

问题 Test Case https://codesandbox.io/s/rr00y9w2wm Steps to reproduce Click on Topics Click on Rendering with React OR Go to https://rr00y9w2wm.codesandbox.io/topics/rendering Expected Behavior match.params.topicId should be identical from both the parent Topics component should be the same as match.params.topicId when accessed within the Topic component Actual Behavior match.params.topicId when accessed within the Topic component is undefined match.params.topicId when accessed within the Topics

问题 I have already reviewed some of the answers to such question, however, I want to ask my question differently. Lets say we have a string like : "level1.level2.level3. ..." that indicates a nested property in an object called Obj . The point is that we may not know that how many nested properties exist in this string. For instance, it may be "level1.level2" or "level1.level2.level3.level4". Now, I want a function that given the Obj and the string of properties as input, simply tell us that if

问题 The following C++ code gives me these errors when compiled: covariant.cpp:32:22: error: invalid covariant return type for ‘virtual Q<B> C::test()’ covariant.cpp:22:22: error: overriding ‘virtual Q<A> B::test()’ I do not want to change the line virtual Q<B> test() {} to virtual Q<A> test() {} although it removes the compilation errors. Is there another way to solve this problem? template <class T> class Q { public: Q() {} virtual ~Q() {} }; class A { public: A() {} virtual ~A() {} }; class B {