我是python的初学者.我想知道是否有任何内置函数或其他方式,所以我可以在python 2.7中实现以下:
在列表和子列表中查找all -letter并将其替换为['not',letter]
例如:查找下面列表中以 - 开头的所有项目,并将其替换为['not',letter]
Input : ['and', ['or', '-S', 'Q'], ['or', '-S', 'R'], ['or', ['or', '-Q', '-R'], '-S']]
Output : ['and', ['or', ['not','S'], 'Q'], ['or', ['not','S'], 'R'], ['or', ['or', ['not','Q'], ['not','R']], ['not','S']]]
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任何人都可以建议如何在python中做到这一点.谢谢
我在android studio中创建了两个空白活动,它看起来默认添加了后退箭头.我MainActivity是的父母ResultActivity.我想维持这种层次结构,但想要摆脱后退箭头.

我有一个强力解决方案来计算输入字符串中的所有子串在O(n ^ 2)时间内.当我的输入字符串很长时,它需要很长时间.
我们怎样才能在O(n)时间内找到所有可能的子串?
我只查找子字符串中第一个和最后一个字符相同的所有子字符串的计数.正如您所看到的,我只在下面的代码中从函数返回count.我想在O(n)时间做
我的暴力解决方案:
// I am calculating count of all substrings where first and last substring character are equal
public class Solution {
public static void main(String[] args) {
String inputString = "ababaca";
System.out.println(findSubstringByBruteForcce(inputString, inputString.length()));
}
private static long findSubstringByBruteForcce(String inputString, int length) {
long count = 0;
for (int i = 0; i < length; i++) {
for (int j = 1; j <= length - i; j++) {
String str = inputString.substring(i, i + j); …Run Code Online (Sandbox Code Playgroud) 下面是我的 Ruby on Rails 代码 -
inactive_list = [1,2,3,4,5]
raw_data = []
data = {
name: "Test",
full_name: "Test data"
}
if inactive_list.include? <<id of data>>
data[:active] = false
else
data[:active] = true
end
raw_data << data
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对于 if...else 语句,我收到 Rubocop linting 错误。我尝试进行一些更改,但无法修复 linting Rubocop 错误。
C: Style/ConditionalAssignment: Use the return of the conditional for variable assignment and comparison.
Run Code Online (Sandbox Code Playgroud) 我有一个自定义 Spring Security 过滤器,它被多次调用,但我不明白为什么。我搜索了它并尝试FilterRegistrationBean按照一些帖子的建议添加,但我的安全过滤器仍然被多次调用并抛出以下错误 -
20:57:49.975 [http-nio-8888-exec-2] DEBUG c.s.m.security.RESTSecurityFilter - Authentication success. Updating SecurityContextHolder to contain: org.springframework.security.authentication.UsernamePasswordAuthenticationToken@fb70fff6: Principal: srib; Credentials: [PROTECTED]; Authenticated: true; Details: org.springframework.security.web.authentication.WebAuthenticationDetails@43458: RemoteIpAddress: 0:0:0:0:0:0:0:1; SessionId: BC1D5AB21EE4586F2A76C7901F1F953F; Granted Authorities: ROLE_USER, ROLE_ADMIN
20:57:50.220 [http-nio-8888-exec-2] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Cannot call sendError() after the response has been committed] with root cause
java.lang.IllegalStateException: Cannot call sendError() after the response has been committed …Run Code Online (Sandbox Code Playgroud) 如何等待2分钟完成方法,但如果没有完成则退出并继续?
我想等待2分钟才能完成方法,但是如果它在2分钟内没有完成,那么退出执行并继续前进.
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