annotations

问题 Python doc __future__ In python doc about __future__ there is a table below where it shows that annotations "optional in" 3.7.0b1 and "mandatory in" 4.0 but i am still able to use annotations in 3.8.2 without importing annotations then what is the use of it. >>> def add_int(a:int, b:int) -> int: ... return a + b >>> add_int.__annotations__ {'a': <class 'int'>, 'b': <class 'int'>, 'return': <class 'int'>} I doubt I don't clearly understand the meaning of "optional in" and "mandatory in" here

问题 I have the following code that produce a ggplot that has text (i.e., "calibration") on both facets . I want the text be appeared on the first facet only. I tried a few things but didn't succeed. Any help would be appreciated. library(ggplot2) library(lubridate) set.seed(123) DF1 <- data.frame(Date = seq(as.Date("2001-01-01"), to = as.Date("2005-12-31"), by = "1 month"), Ob = runif(60,1,5), L95 =runif(60, 0,4), U95 = runif(60,2,7), Sim = runif(60,1,5), Loc = rep("Upstream", 60)) DF2 <- data

问题 I have the following code that produce a ggplot that has text (i.e., "calibration") on both facets . I want the text be appeared on the first facet only. I tried a few things but didn't succeed. Any help would be appreciated. library(ggplot2) library(lubridate) set.seed(123) DF1 <- data.frame(Date = seq(as.Date("2001-01-01"), to = as.Date("2005-12-31"), by = "1 month"), Ob = runif(60,1,5), L95 =runif(60, 0,4), U95 = runif(60,2,7), Sim = runif(60,1,5), Loc = rep("Upstream", 60)) DF2 <- data

问题 I have the following code that produce a ggplot that has text (i.e., "calibration") on both facets . I want the text be appeared on the first facet only. I tried a few things but didn't succeed. Any help would be appreciated. library(ggplot2) library(lubridate) set.seed(123) DF1 <- data.frame(Date = seq(as.Date("2001-01-01"), to = as.Date("2005-12-31"), by = "1 month"), Ob = runif(60,1,5), L95 =runif(60, 0,4), U95 = runif(60,2,7), Sim = runif(60,1,5), Loc = rep("Upstream", 60)) DF2 <- data

问题 I have the following code that produce a ggplot that has text (i.e., "calibration") on both facets . I want the text be appeared on the first facet only. I tried a few things but didn't succeed. Any help would be appreciated. library(ggplot2) library(lubridate) set.seed(123) DF1 <- data.frame(Date = seq(as.Date("2001-01-01"), to = as.Date("2005-12-31"), by = "1 month"), Ob = runif(60,1,5), L95 =runif(60, 0,4), U95 = runif(60,2,7), Sim = runif(60,1,5), Loc = rep("Upstream", 60)) DF2 <- data

问题 I've a Entity with @HasLifecycleCallbacks for define prePersist and preUpdate method. My PrePersist method is /** * @ORM\OneToMany(targetEntity="Field", mappedBy="service", cascade={"persist"}, orphanRemoval=true) */ protected $fields; /** * @PrePersist() */ public function populate() { $fieldsCollection = new \Doctrine\Common\Collections\ArrayCollection(); $fields = array(); preg_match_all('/%[a-z]+%/', $this->getPattern(), $fields); if (isset($fields[0])) { foreach ($fields[0] as $field

问题 How can I read read the value of a Java method annotation at runtime with ASM ? The Annotation has only a CLASS RetentionPolicy , so it's not possible to do that with Reflections. | Policy CLASS : Annotations are to be recorded in the class file by the compiler but need not be retained by the VM at run time Example : I want to extract the value Carly Rae Jepsen out of the artist field at runtime: public class SampleClass { @MyAnnotation(artist = "Carly Rae Jepsen") public void callMeMaybe(){}

问题 How can I read read the value of a Java method annotation at runtime with ASM ? The Annotation has only a CLASS RetentionPolicy , so it's not possible to do that with Reflections. | Policy CLASS : Annotations are to be recorded in the class file by the compiler but need not be retained by the VM at run time Example : I want to extract the value Carly Rae Jepsen out of the artist field at runtime: public class SampleClass { @MyAnnotation(artist = "Carly Rae Jepsen") public void callMeMaybe(){}

问题 How can I change what a method is doing in Java ? I mean, I am trying to use annotations to make the following code @Anno1(Argument = "Option1") public class TestClass { @Anno2 public void test() { } } Into public class TestClass { private static StaticReference z; public void test() { z.invokeToAll(); } } This is a very simplified example of what I am trying to do. Anno1 will have many possible combinations, but this is not my problem so far. My problem is how to add code to method test() I

问题 How can I change what a method is doing in Java ? I mean, I am trying to use annotations to make the following code @Anno1(Argument = "Option1") public class TestClass { @Anno2 public void test() { } } Into public class TestClass { private static StaticReference z; public void test() { z.invokeToAll(); } } This is a very simplified example of what I am trying to do. Anno1 will have many possible combinations, but this is not my problem so far. My problem is how to add code to method test() I