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如何使用 taglib(How to use taglib)

 我有A班：  
package a;

public class A {
private int x = 9;

public int getX() {
    return x;
}
}
 
 和ajsp.jsp文件：  
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<jsp:useBean id = "a" class = "a.A" />
<c:out value = "${a.x}" />
</body>
</html>
 
 当我运行它时，它会给出一个错误：  
 
  org.apache.jasper.JasperException：/ajsp.jsp(11,0）PWC6236：根据标记文件中的TLD或属性指令，属性值不接受任何表达式  
 
 如果不是<c:out value = "${ax}" />我使用<jsp:getProperty property="x" name="a"/>它会变得完美。 那么，问题是什么？ 感谢提前。 

I have the class A: 
package a;

public class A {
private int x = 9;

public int getX() {
    return x;
}
}
 
and the ajsp.jsp file: 
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<jsp:useBean id = "a" class = "a.A" />
<c:out value = "${a.x}" />
</body>
</html>
 
when i run it, it gives an error : 
 
 org.apache.jasper.JasperException: /ajsp.jsp(11,0) PWC6236: According to TLD or attribute directive in tag file, attribute value does not accept any expressions 
 
if instead of <c:out value = "${a.x}" /> i use <jsp:getProperty property="x" name="a"/> it goes perfect. So, what is the problem? Thank advance.

原文：https://stackoverflow.com/questions/3028922

更新时间：2023-12-18 21:12

最满意答案

 您可以使用functools.reduce ：  
from functools import reduce

def some_func(df, cond_list):
    return df[reduce(lambda x,y: x&y, cond_list)] 
 或者，像@AryaMcCarthy所说，你可以使用运算符包中的and_ ：  
from functools import reduce
from operator import and_

def some_func(df, cond_list):
    return df[reduce(and_, cond_list)] 
 或者与numpy一样 - 比如@ayhan说 - 这也是一个逻辑和减少：  
from numpy import logical_and

def some_func(df, cond_list):
    return df[logical_and.reduce(cond_list)] 
 所有三个版本都为您的样本输入生成以下输出：  
>>> some_func(df, [cond1, cond2])
       Sample  DP  GQ   AB
1  HG_12_34_2  50  45  0.9
2     KD_89_9  76  67  0.7
>>> some_func(df, [cond1, cond2, cond3])
Empty DataFrame
Columns: [Sample, DP, GQ, AB]
Index: []

You can use functools.reduce for that: 
from functools import reduce

def some_func(df, cond_list):
    return df[reduce(lambda x,y: x&y, cond_list)] 
Or, like @AryaMcCarthy says, you can use and_ from the operator package: 
from functools import reduce
from operator import and_

def some_func(df, cond_list):
    return df[reduce(and_, cond_list)] 
or with numpy - like @ayhan says - which has also a logical and reduction: 
from numpy import logical_and

def some_func(df, cond_list):
    return df[logical_and.reduce(cond_list)] 
All three versions produce - for your sample input - the following output: 
>>> some_func(df, [cond1, cond2])
       Sample  DP  GQ   AB
1  HG_12_34_2  50  45  0.9
2     KD_89_9  76  67  0.7
>>> some_func(df, [cond1, cond2, cond3])
Empty DataFrame
Columns: [Sample, DP, GQ, AB]
Index: []

如何使用 taglib(How to use taglib)

最满意答案

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