Answer 1

it = (gzip.open(f, 'rb') for f in jsonfilename)

这可能是给定GZIP产生二进制文件的正确参数。

Answer 2

您可以创建 global 变量 isloading 并使用 valueNotifier 和 valuelistenablebuilder 显示 cignularProgressIndicator（）如果是。
我已经重构了您的代码。

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

void main() => runApp(const MaterialApp(home: PageLoadApp()));
final isLoading = ValueNotifier<bool>(true);

class PageLoadApp extends StatefulWidget {
  const PageLoadApp({Key? key}) : super(key: key);

  @override
  State<PageLoadApp> createState() => _PageLoadAppState();
}

class _PageLoadAppState extends State<PageLoadApp> {
  static String get _url {
    // await Future.delayed(const Duration(seconds: 10));
    return 'https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/discover-canada/read-online/canadas-history.html';
  }

  @override
  Widget build(BuildContext context) => Scaffold(
          body: Scaffold(
        body: ValueListenableBuilder<bool>(
            valueListenable: isLoading,
            builder: (context, value, _) {
              return Scaffold(
                body: Stack(
                  children: <Widget>[
                    WebViewWidget(
                      url: _url,
                    ),
                    (value == true
                        ? Scaffold(
                            body: Center(
                              child: CircularProgressIndicator(),
                            ),
                          )
                        : Container()),
                  ],
                ),
              );
              ;
            }),
      ));
}

class WebViewWidget extends StatefulWidget {
  final String url;

  const WebViewWidget({
    required this.url,
  });

  @override
  _WebViewWidget createState() => _WebViewWidget();
}

class _WebViewWidget extends State<WebViewWidget> {
  late WebView _webView;
  final Completer<WebViewController> _controller =
      Completer<WebViewController>();

  Iterable<Future<void>> cleanupLoadedHtmlPage(WebViewController controller) {
    const List<String> javascriptToExecute = [
      'document.getElementById("wb-lng").hidden = true;',
      'document.getElementById("wb-srch").hidden = true',
      'document.getElementsByClassName("gcweb-menu")[0].hidden = true',
      'document.getElementsByClassName("mwsalerts")[0].hidden = true',
      'document.getElementById("wb-bc").hidden = true',
      'document.getElementsByClassName("pagination")[0].hidden = true',
      'document.getElementsByClassName("pagedetails")[0].hidden = true',
      'document.getElementsByClassName("global-footer")[0].hidden = true'
    ];
    return javascriptToExecute.map((js) {
      print("removing $js");
      return controller.runJavascript(js);
    });
  }

  @override
  void initState() {
    super.initState();
    _webView = WebView(
      initialUrl: widget.url,
      javascriptMode: JavascriptMode.unrestricted,
      onWebViewCreated: (WebViewController webViewController) {
        _controller.complete(webViewController);
      },
      onProgress: (int progress) {},
      onPageStarted: (String url) {
        isLoading.value = true;
        print('Page started loading: $url');
      },
      onPageFinished: (String url) async {
        // Navigator.pop(context);

        print('Page finished loading: $url');

        final controller = await _controller.future;
        var cleanupFuture = cleanupLoadedHtmlPage(controller);
        Future.wait(cleanupFuture).then((value) {
          print("Clean up done => $value");
        });
        // for demo purposes, wait for 3 seconds
        await Future.delayed(Duration(seconds: 3));
        isLoading.value = false;
      },
    );
  }

  @override
  void dispose() {
    super.dispose();
    //_webView = null;
  }

  @override
  Widget build(BuildContext context) => _webView;
}

• 在这里是Google团队的YouTube视频，解释了< valuelistenablebuilder

Answer 3

不要使事情复杂化

const {data} = useQuery('entitle', apiCall)
const {title=[], desc=[]} = data

Answer 4

我知道有可能下降一个目录IE：

parendmodule.py：

from childDirectory.childScript import runChildMain
def runFunction():
    runChildMain()
runFunction()

childscript.py

def runChildMain():
    print("HIT Run child main")

if __name__ == "__main__":
    runChildMain()

如果必须使用该文件结构，则可能必须使用该文件结构：

sys.path.append( os.path.dirname(os.path.realpath(__file__))+'/..')

Answer 5

有几种方法可以解决这个问题。如果您知道第一行的大小，则应该能够使用 fseek 移动文件的位置，而不是使用 getline 以获取文件的每一行

int fseek(FILE *stream, long offset, int whence);

： 参数可以是：

• seek_set ：开始
• seek_cur ：当前位置
• seek_end ：结束

另一个选项将封装整个文件读取一段时间循环：

    char *line = NULL;
    size_t linecap = 0;
    ssize_t linelen;
    int counter = 0;

    while((linelen = getline(&line, &linecap, file)) != -1){
        if counter == 0{
            sscanf(line, "%d %d\n", &primNum, &secNum);
        }else{
            //Process your line
        }
        counter++; //This would give you your total line length
    }

Answer 6

它不是浮点或任何其他合并：

let in_file_name: PathBuf;
if let Some(infile) = matches.get_one::<PathBuf>("infile") {
    in_file_name = infile.to_owned().into();

工作时遇到相同的问题

let in_file_name: PathBuf;

if let Some(infile) = matches.get_one::<String>("infile") {
    in_file_name = infile.to_owned().into();

。
-Michael

Answer 7

很难确切说明您的含义，因为片段并没有真正渲染任何内容，并且不包括每个部分的CSS，但是，我确实看到HTML代码中可能导致渲染不一致的两个小问题。

首先，项目div没有按钮。其次，Talk Div中的＆lt; p＆gt; 在className中具有错别字。它说 talk-desc＆gt; 而不是 talk-desc 。

也就是说，如果我添加按钮并从您的文件中删除特定的CSS，则它们都相同。因此，容器谈话 div实际上是正确继承的，您看到的渲染差异在您添加了CSS样式的嵌套元素中。

/************/
/* base.css */
/************/


/* color palette from <https://github.com/vuejs/theme> */

 :root {
  --vt-c-white: #ffffff;
  --vt-c-white-soft: #f8f8f8;
  --vt-c-white-mute: #f2f2f2;
  --vt-c-black: #181818;
  --vt-c-black-soft: #222222;
  --vt-c-black-mute: #282828;
  --vt-c-indigo: #2c3e50;
  --vt-c-divider-light-1: rgba(60, 60, 60, 0.29);
  --vt-c-divider-light-2: rgba(60, 60, 60, 0.12);
  --vt-c-divider-dark-1: rgba(84, 84, 84, 0.65);
  --vt-c-divider-dark-2: rgba(84, 84, 84, 0.48);
  --vt-c-text-light-1: var(--vt-c-indigo);
  --vt-c-text-light-2: rgba(60, 60, 60, 0.66);
  --vt-c-text-dark-1: var(--vt-c-white);
  --vt-c-text-dark-2: rgba(235, 235, 235, 0.64);
}


/* semantic color variables for this project */

 :root {
  --color-background: var(--vt-c-white);
  --color-background-soft: var(--vt-c-white-soft);
  --color-background-mute: var(--vt-c-white-mute);
  --color-border: var(--vt-c-divider-light-2);
  --color-border-hover: var(--vt-c-divider-light-1);
  --color-heading: var(--vt-c-text-light-1);
  --color-text: var(--vt-c-text-light-1);
  --section-gap: 160px;
}

@media (prefers-color-scheme: dark) {
   :root {
    --color-background: var(--vt-c-black);
    --color-background-soft: var(--vt-c-black-soft);
    --color-background-mute: var(--vt-c-black-mute);
    --color-border: var(--vt-c-divider-dark-2);
    --color-border-hover: var(--vt-c-divider-dark-1);
    --color-heading: var(--vt-c-text-dark-1);
    --color-text: var(--vt-c-text-dark-2);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  font-weight: normal;
  position: relative;
}

body {
  min-height: 100vh;
  color: var(--color-text);
  background: var(--color-background-soft);
  transition: color 0.5s, background-color 0.5s;
  line-height: 1.6;
  font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}



/************/
/* main.css */
/************/


/* Just has a bunch of normal stylings like- */

// .talk-button {
//   border: #ffff00;
//   border-width: 2px;
//   border-style: solid;
//   border-radius: 0.5rem;
//   background-color: transparent;
//   color: rgb(224, 224, 224);
//   opacity: 80%;
//   margin-top: 4rem;
//   padding-top: 1rem;
//   padding-left: 0.3rem;
//   padding-right: 0.3rem;
//   padding: 1rem;
//   font-size: 16px;
// }

// .talk-desc {
//   padding-top: 2rem;
//   padding-bottom: 2rem;
//   max-width: 65%;
//   font-size: 20px;
//   color: rgb(165, 165, 165);
// }

// .talk-subtitle {
//   margin-top: 10rem;
// }

<div class="encompass">
  <div class="hero-section">
    <h1 class="small-heading">
      <span class=""></span>
      <span class="period" style="color: yellow"></span>
    </h1>
    <div class="big-heading">
      <h2>
      <span class="build"></span>
      <span class="random-text"></span>
      </h2>
    </div>
    <p class="main-desc"></p>
    <button class="linkedin">LinkedIn Button</button>
  </div>

  <div class="about">
    <h1 class="subtitle">About Subhead</h1>
    <p class="about-desc">About description</p>
    <button class="coffee">About Button</button>
  </div>

  <div class="projects">
    <h1 class="proj-subtitle">Projects Subhead</h1>
    <p class="proj-desc">Projects description</p>
        <button class="proj-button">Projects Button</button>
  </div>

  <div class="talk">
    <h1 class="talk-subtitle">Talk Subhead</h1>
    <p class="talk-desc">Talk description</p>
    <button class="talk-button">Talk Button</button>
  </div>

</div>

Answer 8

是的，Sudo特权在Studio Lab中不可用。最好的选择是找到一个可以安装而无需Sudo特权的库。

您也可以尝试 - conda install -c conda -forge rdki

Answer 9

您可以使您的 student （从 重命名）类以实现可比性接口为了使用 arrays.sort.sort.sort.sort 方法。在这种情况下，您必须添加到 compareTo 方法。

class Student implements Comparable<Student> { //DaftarSiswa
    public int number;
    public String name;

    public Student(int number, String name) {
        this.number = number;
        this.name = name;
    }

    @Override
    public int compareTo(Student o) {
        return this.number - o.number;
    }

    @Override
    public String toString() {
        return "Student {number=" + number + ", name='" + name +"'}\n";
    }
}

public class Test { //NomorUrut
    public static void main(String[] args) {
        Student[] data = new Student[10];
        data[0] = new Student(10, "Brycen");
        data[1] = new Student(6, "Devan");
        data[2] = new Student(3, "Rylan");
        data[3] = new Student(1, "Gordy");
        data[4] = new Student(2, "Tim");
        data[5] = new Student(4, "Curtis");
        data[6] = new Student(5, "Abe");
        data[7] = new Student(9, "Melvin");
        data[8] = new Student(8, "Ansel");
        data[9] = new Student(7, "Dalton");

        Arrays.sort(data);

        System.out.println(Arrays.toString(data));
    }
}

Answer 10

如果要连接 azure托管身份与azure databricks，

请按照此操作。 -Identity“> so 线程 @Alex Ott

示例代码

 来自Databricks导入SQL
    来自azure.Identity Import cluttratecretcredential
    导入操作系统
    tenant_id ='enter_tenant_id'
    client_id ='enter_client_id'
    client_secret = os.environ ['sp_secret']
    csc = clienterecretcredential（tenant_id，client_id，client_secret）
    范围='2xxxxx/.default'
    token = csc.get_token（dbx_scope）.token
 

请参阅此 用于将SQL连接到Azure Databricks

Answer 11

带有子选项的子句中的不是最优雅的（至少在过去，也不是执行查询的最佳方法）。

为了使用 JOIN 具有绝对相同结果的子句，请尝试下面的查询，这很简洁：

q = session.query(Course).filter(Course.students.any(Student.id == 2))

并将产生以下 sql ：

SELECT course.id,
       course.name
FROM course
WHERE EXISTS
    (SELECT 1
     FROM association,
          student
     WHERE course.id = association.course_id
       AND student.id = association.student_id
       AND student.id = ?)

但是，避免在 student 表格，以下更明确的查询将产生相同的结果：

q = (
    session
    .query(Course)
    .join(
        association_table, 
        (Course.id == association_table.c.course_id) & (association_table.c.student_id == 2),
    )
)

这将导致 sql 与以下相似：

SELECT  course.id,
        course.name
FROM    course
   JOIN association
     ON course.id = association.course_id
    AND association.student_id = ?

Answer 12

编写循环时，您需要考虑如何存储每次迭代的输出。我怀疑 getBb 的输出非常复杂（也许是两个列矩阵？“ bb”用于“边界框”？），所以我将使用“列表”进行存储。

cities <- c("Name1", "Name2")

## initialize storage
output <- vector("list", length(cities))
## add names to list entries
names(output) <- cities

## a loop with numeric index
for (i in 1:length(cities)) {
      output[[i]] <- getbb(
      cities[i],
      format_out = "matrix",
      base_url = "https://nominatim.openstreetmap.org",
      featuretype = "settlement",
      limit = 10,
    )
}

最后，您可以使用城市名称从列表中提取值：

## result for city "Names1"
output[["Names1"]]

Answer 13

您需要为每个项目都有单独的标志。
例如，您可以参考下面的摘要。

您需要检查索引，然后将值分配给该标志

const tempData = [...arryData];
          tempData[index] = {
            ...tempData[index],
            isActive: value,
          };
          setState(tempData);

Answer 14

并不是说要这样做，但是在没有使用效果的情况下做OP要求的事情并不难。

使用承诺在设置器函数的正文中解析新状态：

const getState = <T>(
  setState: React.Dispatch<React.SetStateAction<T>>
): Promise<T> => {
  return new Promise((resolve) => {
    setState((currentState: T) => {
      resolve(currentState);
      return currentState;
    });
  });
};

这就是您的使用方式（示例显示了 Count 和 OUTOFSYNCCOUNT /之间的比较UI渲染中的Synccount ）：

const App: React.FC = () => {
  const [count, setCount] = useState(0);
  const [outOfSyncCount, setOutOfSyncCount] = useState(0);
  const [syncCount, setSyncCount] = useState(0);

  const handleOnClick = async () => {
    setCount(count + 1);

    // Doesn't work
    setOutOfSyncCount(count);

    // Works
    const newCount = await getState(setCount);
    setSyncCount(newCount);
  };

  return (
    <>
      <h2>Count = {count}</h2>
      <h2>Synced count = {syncCount}</h2>
      <h2>Out of sync count = {outOfSyncCount}</h2>
      <button onClick={handleOnClick}>Increment</button>
    </>
  );
};

Answer 15

如果您有各种对象列，例如74个对象列的此数据框和2列的2列，其中每个值都有代表单元的字母：

import pandas as pd 
import numpy as np

dataurl = 'https://raw.githubusercontent.com/RubenGavidia/Pandas_Portfolio.py/main/Wes_Mckinney.py/nutrition.csv'
nutrition = pd.read_csv(dataurl,index_col=[0])
nutrition.head(3)

输出：

    name    serving_size    calories    total_fat    saturated_fat    cholesterol    sodium    choline    folate    folic_acid    ...    fat    saturated_fatty_acids    monounsaturated_fatty_acids    polyunsaturated_fatty_acids    fatty_acids_total_trans    alcohol    ash    caffeine    theobromine    water
0    Cornstarch    100 g    381    0.1g    NaN    0    9.00 mg    0.4 mg    0.00 mcg    0.00 mcg    ...    0.05 g    0.009 g    0.016 g    0.025 g    0.00 mg    0.0 g    0.09 g    0.00 mg    0.00 mg    8.32 g
1    Nuts, pecans    100 g    691    72g    6.2g    0    0.00 mg    40.5 mg    22.00 mcg    0.00 mcg    ...    71.97 g    6.180 g    40.801 g    21.614 g    0.00 mg    0.0 g    1.49 g    0.00 mg    0.00 mg    3.52 g
2    Eggplant, raw    100 g    25    0.2g    NaN    0    2.00 mg    6.9 mg    22.00 mcg    0.00 mcg    ...    0.18 g    0.034 g    0.016 g    0.076 g    0.00 mg    0.0 g    0.66 g    0.00 mg    0.00 mg    92.30 g
3 rows × 76 columns

nutrition.dtypes
name             object
serving_size     object
calories          int64
total_fat        object
saturated_fat    object
                  ...
alcohol          object
ash              object
caffeine         object
theobromine      object
water            object
Length: 76, dtype: object

nutrition.dtypes.value_counts()
object    74
int64      2
dtype: int64

转换为数字的好方法所有列使用正则表达式来替换单位nothing and astype（ float）为了将列数据类型更改为float：

nutrition.index = pd.RangeIndex(start = 0, stop = 8789, step= 1)
nutrition.set_index('name',inplace = True)
nutrition.replace('[a-zA-Z]','', regex= True, inplace=True)
nutrition=nutrition.astype(float)
nutrition.head(3)

输出：

serving_size    calories    total_fat    saturated_fat    cholesterol    sodium    choline    folate    folic_acid    niacin    ...    fat    saturated_fatty_acids    monounsaturated_fatty_acids    polyunsaturated_fatty_acids    fatty_acids_total_trans    alcohol    ash    caffeine    theobromine    water
name
Cornstarch    100.0    381.0    0.1    NaN    0.0    9.0    0.4    0.0    0.0    0.000    ...    0.05    0.009    0.016    0.025    0.0    0.0    0.09    0.0    0.0    8.32
Nuts, pecans    100.0    691.0    72.0    6.2    0.0    0.0    40.5    22.0    0.0    1.167    ...    71.97    6.180    40.801    21.614    0.0    0.0    1.49    0.0    0.0    3.52
Eggplant, raw    100.0    25.0    0.2    NaN    0.0    2.0    6.9    22.0    0.0    0.649    ...    0.18    0.034    0.016    0.076    0.0    0.0    0.66    0.0    0.0    92.30
3 rows × 75 columns

nutrition.dtypes
serving_size     float64
calories         float64
total_fat        float64
saturated_fat    float64
cholesterol      float64
                  ...
alcohol          float64
ash              float64
caffeine         float64
theobromine      float64
water            float64
Length: 75, dtype: object

nutrition.dtypes.value_counts()
float64    75
dtype: int64

现在数据集很干净，您只能使用Regex和Astype（）使用此数据框进行数字操作。

如果要收集单元并粘贴在标题上，例如胆固醇_mg可以使用此代码：

nutrition.index = pd.RangeIndex(start = 0, stop = 8789, step= 1)
nutrition.set_index('name',inplace = True)
nutrition.astype(str).replace('[^a-zA-Z]','', regex= True)
units = nutrition.astype(str).replace('[^a-zA-Z]','', regex= True)
units = units.mode()
units = units.replace('', np.nan).dropna(axis=1)
mapper = { k: k + "_" + units[k].at[0] for k in units}
nutrition.rename(columns=mapper, inplace=True)
nutrition.replace('[a-zA-Z]','', regex= True, inplace=True)
nutrition=nutrition.astype(float)