set

问题 Hi guys,i have a doubt regarding comparing two sets >>> x = {"a","b","1","2","3"} >>> y = {"c","d","f","2","3","4"} >>> z=x<y >>> print(z) False >>> z=x>y >>> print(z) False In the above logic,for both z=x<y and z=x>y . I'm getting output as False,whereas one of the expression should return True. Could anyone explain me why? 回答1: The < and > operators are testing for strict subsets. Neither of those sets is a subset of the other. {1, 2} < {1, 2, 3} # True {1, 2} < {1, 3} # False {1, 2} < {1,

问题 As you can see below, when I open test.txt and put the words into a set, the difference of the set with the common_words set is returned. However, it is only removing a single instance of the words in the common_words set rather than all occurrences of them. How can I achieve this? I want to remove ALL instances of items in common_words from title_words from string import punctuation from operator import itemgetter N = 10 words = {} linestring = open('test.txt', 'r').read() //set A, want to

问题 If using std::map<std::string,object> to keep objects ordered by name, the map's value_type ( std::pair<string,object> ) is a convenient class which warrants useful functionality, e.g. typedef std::map<std::string,object> object_map; typedef typename object_map::value_type named_object; void function(named_object const&); // with the following possible use case void foo(std::string const&name, object_map const &omap) { auto obj=omap.find(name); if(obj==omap.end()) throw std::runtime_error(

问题 How to use FIND_IN_SET, The values I have is | Val | | No, 1, Yes,5, O, 4| I tried doing FIND_IN_SET('No', Val) And got the value of 1 and then I tried: FIND_IN_SET('No', Val) as 'No', FIND_IN_SET('Yes', Val) as ''Yes' But got the output | No | Yes | | 1 | 0 | How come it suddenly can't find the 'Yes' in the text? Another format: | Val | | No, 1, Yes,5, O, 4 | Note: This is not on 3 rows, just on one row but using the next line(line breaks) for the other values 回答1: Because the actual value

问题 I am using CopyOnWriteArraySet in the following class because I simply like its thread-safe iterator. public class MyClass{ Set _children = new CopyOnWriteArraySet(); public void setChildren(Set children){ _children = children; } public Set getChildren(){ return _children; } } However, I also use Hibernate for persistency which replaces my CopyOnWriteArraySet with its own PersistentSet (which uses HashSet internally). Unfortunately, HashSet is not thread-safe, so I want my CopyOnWriteArraySet

问题 so my code currently generates a set with random integers between 1 and 200. It does this by using a while loop to add values to the set. What I'm having trouble doing is comparing values in a set to see if 2 values are duplicated. If they are, I want to return a bool value or an actual print statement saying they are duplicates. Similarly, I would want to stop generating a set if the duplicate is found within this def abc(c): a = 1 my = set() while a <= c: b = randrange(1, 200) my.add(b) a =

问题 Suppose I am having the following paired-typed lists. I want to calculate the intersection of these lists to generate only the common words not the numbers . The lists are l1 = [('state', 3537), ('t', 2320), ('system', 2086), ('transition', 1882), ('φ', 1703), ('path', 1423), ('ϕ', 1310), ('formula', 1273), ('property', 1194), ('π', 1165), ('α', 1065), ('ctl', 1048), ('action', 1034), ('ψ', 881), ('finite', 845), ('model', 828), ('algorithm', 790), ('process', 734), ('checking', 701), (

问题 I am trying to create a set of dates using DateAdd() function but I am getting errors while trying to pass a set of tuples as parameter. The below code returns a member but I am looking for a set of new dates. WITH Member [EFF INJ DT] AS DATEADD("M",12, [INJURY DATE].CurrentMember) SELECT {[EFF INJ DT]} ON COLUMNS, [INJURY DATE].[DATE].Members ON ROWS FROM [WVWC DATA CUBE FROI SROI] I have the following attempt: WITH Set [EFF INJ DT] AS DATEADD("M",12, [INJURY DATE].CurrentMember) SELECT {

问题 First, I want the top 250 users, and update their top = 1 users = MyTable.objects.order_by('-month_length')[0: 250] for u in users: u.top = 1 u.save() But, actually, I hope there is an elegent way, like this: MyTable.objects.all().update(top=1) And more, from this question: Django: Cannot update a query once a slice has been taken Does that mean CAN NOT WRITE UPDATE ... WHERE ... LIMIT 5 ? 回答1: Until the queryset has been evaluated once (at which point it will cache itself), slicing result in

问题 So I've made some utility classes and implicit conversions for them. However, it works fine when converting from a Seq but not from a Set, although the code is the same, and those two traits seem rather similar at first sight. What could be the problem, and how would I fix it? import scala.collection.mutable.HashMap trait Indexed[T] { def index: T } class IndexMap[T, V <: Indexed[T]] extends HashMap[T, V] { override def put(key: T, value: V): Option[V] = { require(key == value.index) super