小编d4r*_*rty的帖子

由于针对此主题提供的其他解决方案（我也想避免使用jQuery这样的解决方案：stackoverflow）不适用于我的情况，因此我提出了一个新问题。如何使表格标题固定在垂直滚动上？

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<div class=container>
  <div class=row>
    <div class=col-sm-12>
      <div class="table-responsive">
        <table class="table table-condensed table-bordered table-hover fixed_headers">
          <thead>
            <tr>
              <th rowspan="2" style="width: 10px"><span class="text-muted">#</span></th>
              <th rowspan="2">ID</th>
              <th rowspan="2">Name</th>
              <th colspan="4">r 1</th>
              <th colspan="4">r 2</th>
              <th rowspan="2" ng-click="sortTableBy('recognized')" class="change-sort-order">ERK
              </th>
              <th rowspan="2">ERW
              </th>
              <th rowspan="2"><span class="text-muted">Radar</span></th>
              <th rowspan="2"><span class="text-muted">RISS</span></th>
            </tr>
            <tr>
              <th>
                A 1
              </th>
              <th>
                A 2
              </th>
              <th>
                A 3
              </th>
              <th>
                A 4
              </th>
              <th>
                A …

我从 RXJS 5.x 更新到 RXJS 6.2.2 并且在解决迁移错误时遇到问题。

RXJS 6 中不再有 IntervalObservables 了吗？我在以下角度组件中使用了 IntervalObservable

import {Component, OnInit} from '@angular/core';
import {IntervalObservable} from 'rxjs/observable/IntervalObservable';

@Component({
  selector: 'app-date-time-display',
  templateUrl: './date-time-display.component.html',
  styleUrls: ['./date-time-display.component.css']
})
export class DateTimeDisplayComponent implements OnInit {

  constructor() {
  }

  today = Date.now();

  ngOnInit() {
    IntervalObservable.create(1000)
    // .takeWhile(() => this.alive) // only fires when component is alive
      .subscribe(() => {
        this.today = Date.now();
      });
  }
}

当我运行“ng serve”或“ng build”时，出现以下错误：

Module not found: Error: Can't resolve 'rxjs/observable/IntervalObservable' in 'C:\Users\Daniel\Documents\IMA\Porsche_lack\git\webapp\porsche-lack-tracking\src\app\date-time-display'
i ?wdm?: Failed …

首先，我读了这个问题，但它实际上不包括我想要的方法。此外，否定实际值不适用于我的用例。

Heapq 文档：https://docs.python.org/3.6/library/heapq.html

假设我的堆中有一个数据类对象列表。只有a属性决定对象的顺序。

import heapq
from dataclasses import dataclass

@dataclass
class C:
    a: int
    b: int
    def __lt__(self, other):
        return self.a < other.a

l=[C(2,1),C(9,109),C(2,4),C(9,4)]

print(heapq.heappop(l)) # C(a=2, b=1)
print(heapq.heappop(l)) # C(a=2, b=4)
print(heapq.heappop(l)) # C(a=9, b=109)
print(heapq.heappop(l)) # C(a=9, b=4)

现在我想要一个倒序。因此，我将该行更改return self.a < other.a为return self.a > other.a. 结果：

import heapq
from dataclasses import dataclass

@dataclass
class C:
    a: int
    b: int
    def __lt__(self, other):
        return self.a > other.a

l=[C(2,1),C(9,109),C(2,4),C(9,4)]

print(heapq.heappop(l)) …

我检查了 PyInstaller 和 FastAPI（超出最大递归深度）并且 Pyinstaller 编译的 Uvicorn 服务器无法正确启动

FastAPI 演示main.py：

import uvicorn
from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def root():
    return {"hello": "world"}

if __name__ == '__main__':
    uvicorn.run(app, host="0.0.0.0", port=58000, reload=False)

首先运行 pyinstallerpyinstaller -F main.py --clean并添加hidden_imports规范：

hidden_imports=[
                'uvicorn.logging',
                'uvicorn.loops',
                'uvicorn.loops.auto',
                'uvicorn.protocols',
                'uvicorn.protocols.http',
                'uvicorn.protocols.http.auto',
                'uvicorn.protocols.websockets',
                'uvicorn.protocols.websockets.auto',
                'uvicorn.lifespan',
                'uvicorn.lifespan.on',
            ]

它工作得很好，但是当工人大于 1 时，应用程序必须是字符串：

WARNING: You must pass the application as an import string to enable 'reload' or 'workers'.

所以我改为：

if __name__ == '__main__': …