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问题 I'm setting up a Gatsby Project with gatsby-plugin-sass . my gatsby-config.js file: module.exports = { plugins: [ 'gatsby-plugin-resolve-src', 'gatsby-plugin-sass', 'gatsby-plugin-react-helmet', { resolve: `gatsby-source-filesystem`, options: { name: `images`, path: `${__dirname}/src/assets/images`, }, }, ], } I have the following styles file structure : | |src |-styles |--base |--- _variables.scss |--components |--- _Buttons.scss |--- ... |--main.scss Im my _Buttons.scss file I'm importing

问题 This question already has answers here : Why does Date.parse give incorrect results? (11 answers) Closed 4 years ago . I feel like I am missing something here. The Date.getDay() method is supposed to return a value from 0-6. 0 for Sunday and 6 for Saturday. Now I have two dates, both are 'Sunday' which should return 0. new Date('1990-11-11').getDay() // returns 6 new Date('2016-1-3').getDay() // returns 0 What is causing the discrepancy? I dare to question the validity of the .getDay() method

问题 I am using Python 2.7.3. Can anybody explain the difference between the literals: '\u0391' and: u'\u0391' and the different way they are echoed in the REPL below (especially the extra slash added to a1): >>> a1='\u0391' >>> a1 '\\u0391' >>> type(a1) <type 'str'> >>> >>> a2=u'\u0391' >>> a2 u'\u0391' >>> type(a2) <type 'unicode'> >>> 回答1: You can only use unicode escapes ( \uabcd ) in a unicode string literal. They have no meaning in a byte string. A Python 2 Unicode literal ( u'some text' )

问题 I am using Python 2.7.3. Can anybody explain the difference between the literals: '\u0391' and: u'\u0391' and the different way they are echoed in the REPL below (especially the extra slash added to a1): >>> a1='\u0391' >>> a1 '\\u0391' >>> type(a1) <type 'str'> >>> >>> a2=u'\u0391' >>> a2 u'\u0391' >>> type(a2) <type 'unicode'> >>> 回答1: You can only use unicode escapes ( \uabcd ) in a unicode string literal. They have no meaning in a byte string. A Python 2 Unicode literal ( u'some text' )

问题 I have a situation with some parallel lists that need to be filtered based on the values in one of the lists. Sometimes I write something like this to filter them: lista = [1, 2, 3] listb = [7, 8, 9] filtered_a, filtered_b = zip(*[(a, b) for (a, b) in zip(lista, listb) if a < 3]) This gives filtered_a == (1, 2) and filtered_b == (7, 8) However, changing the final condition from a < 3 to a < 0 causes an exception to be raised: Traceback (most recent call last): ... ValueError: need more than 0

问题 I am trying to use APScheduler to run periodic jobs with an IntervalTrigger, I've intentionally set the maximum number of running instances to one because I don't want jobs to overlap. Problem is that after some time the scheduler starts reporting that the maximum number of running instance for a job have been reached even after it previously informed that the job finished successfully, I found this on the logs: 2015-10-28 22:17:42,137 INFO Running job "ping (trigger: interval[0:01:00], next

问题 I have a situation with some parallel lists that need to be filtered based on the values in one of the lists. Sometimes I write something like this to filter them: lista = [1, 2, 3] listb = [7, 8, 9] filtered_a, filtered_b = zip(*[(a, b) for (a, b) in zip(lista, listb) if a < 3]) This gives filtered_a == (1, 2) and filtered_b == (7, 8) However, changing the final condition from a < 3 to a < 0 causes an exception to be raised: Traceback (most recent call last): ... ValueError: need more than 0

问题 I know that calling the StateHasChanged() method notifies the component that the state has changed and that it should re-render. However, I also see calls to await InvokeAsync(StateHasChanged) or await InvokeAsync(() => StateHasChanged()) in other people's code, but I don't quite understand how it compares to StateHasChanged() and when should one be favored over the other, and why . The only information I could find was this part of the Blazor docs, it says: In the event a component must be

问题 I have a situation with some parallel lists that need to be filtered based on the values in one of the lists. Sometimes I write something like this to filter them: lista = [1, 2, 3] listb = [7, 8, 9] filtered_a, filtered_b = zip(*[(a, b) for (a, b) in zip(lista, listb) if a < 3]) This gives filtered_a == (1, 2) and filtered_b == (7, 8) However, changing the final condition from a < 3 to a < 0 causes an exception to be raised: Traceback (most recent call last): ... ValueError: need more than 0

问题 I'm using Infinispan with 6.0.2 with Hibernate Search 4.4.0. In the begining, after I execute a query like CacheQuery cq = SearchManager.getQuery(query,Hibernate.class).projection("id"); I use the cq.list() to get "id". But now the number of results reaches 300.000, because of the designing fo DB(cant change), the duplicate id is almost 29,000. I wrote this to get "id": for(int i=0;i<listObject.size();i++) { Object[] rdf = (Object[])listObject.get(i); if(!result.contains((String) rdf[0]))