attributes

问题 When defining a record class, how do I target the attributes to the parameter, field or property? For instance, I would like to use JsonIgnore but this doesn't compile as it has an attribute usage restriction to the field or property: record Person(string FirstName, string LastName, [JsonIgnore] int Age); 回答1: To target the various parts of the expanded class, use the appropriate attribute target. For instance: // Target the property, use `property` record Person(string FirstName, string

问题 When defining a record class, how do I target the attributes to the parameter, field or property? For instance, I would like to use JsonIgnore but this doesn't compile as it has an attribute usage restriction to the field or property: record Person(string FirstName, string LastName, [JsonIgnore] int Age); 回答1: To target the various parts of the expanded class, use the appropriate attribute target. For instance: // Target the property, use `property` record Person(string FirstName, string

问题 When defining a record class, how do I target the attributes to the parameter, field or property? For instance, I would like to use JsonIgnore but this doesn't compile as it has an attribute usage restriction to the field or property: record Person(string FirstName, string LastName, [JsonIgnore] int Age); 回答1: To target the various parts of the expanded class, use the appropriate attribute target. For instance: // Target the property, use `property` record Person(string FirstName, string

问题 Does anybody have any idea why this code doesn't work? import turtle test = turtle.Turtle() test.color("orange") test.pensize(5) test.shape("turtle") test.forward(100) I use python 3.8 回答1: You've made a common error that I happended to also make when I was investigating your question. I assume you have your code written in a file called ' turtle.py '? When you import turtle, it imports your file, not the turtle library. Rename your file to something other than turtle.py, and your code should

问题 Does anybody have any idea why this code doesn't work? import turtle test = turtle.Turtle() test.color("orange") test.pensize(5) test.shape("turtle") test.forward(100) I use python 3.8 回答1: You've made a common error that I happended to also make when I was investigating your question. I assume you have your code written in a file called ' turtle.py '? When you import turtle, it imports your file, not the turtle library. Rename your file to something other than turtle.py, and your code should

问题 This question already has an answer here : XSLT 1.0 Kludge cleanup (1 answer) Closed 2 months ago . <?xml version="1.0" encoding="UTF-8"?> <Root> <Destination>acme.com</Destination> <Record> <FirstField length="10">AAAA</FirstField> <SecondField length="15">BBBB</SecondField> <SubRecord> <ThirdField length="20">CCCC</ThirdField> <FourthField length="8">DDDD</FourthField> </SubRecord> </Record> </Root> Hi, I have a requirement to take this xml example where the elements inside the node will be

问题 Say I have a vector and its name as follows: vct <- c(67, "apple", 88, "orange", 71) names(vct) <- c("c1", "b2", "d66", "a65", "a11") Now I want the first element 67 to be as is and order the rest on the order of their names. So that it appears: "67", "71", "orange", "apple", "88". 回答1: Do you mean something like this? first <- 67 inds <- match(first, vct) result <- vct[c(inds, setdiff(order(names(vct)), inds))] result # c1 a11 a65 b2 d66 # "67" "71" "orange" "apple" "88" 回答2: You can use -1

问题 Say I have a vector and its name as follows: vct <- c(67, "apple", 88, "orange", 71) names(vct) <- c("c1", "b2", "d66", "a65", "a11") Now I want the first element 67 to be as is and order the rest on the order of their names. So that it appears: "67", "71", "orange", "apple", "88". 回答1: Do you mean something like this? first <- 67 inds <- match(first, vct) result <- vct[c(inds, setdiff(order(names(vct)), inds))] result # c1 a11 a65 b2 d66 # "67" "71" "orange" "apple" "88" 回答2: You can use -1

问题 class Ant: count = 0 def __init__(self): if count == 0: self.real = True else: self.real = False count += 1 So basically what I want to achieve is I want only the first instance of this class to have the "real" attribute to be True , and the subsequent attributes to be False . I know right now this is going to give me unboundlocal error for count . How do I make this work? 回答1: Change count To Ant.count As count is a class member (shared between all instances of Ant class) and does not belong

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . Improve this question I have code, and I don't know how to solve problem. Code: import dateutil.parser import datetime from novaclient.v2 import client as nova_client from keystoneclient.auth.identity import v2 from keystoneclient import session auth=v2.Password(auth_url="http:/