小编use*_*828的帖子

我试着运行以下代码

package main

import (
    "encoding/json"
    "fmt"
    /*"labix.org/v2/mgo"
    "labix.org/v2/mgo/bson"*/
)

func insertEntry(j *map[string]interface{}, entry string) {
    err := json.Unmarshal([]byte(entry), j)
    if err != nil {
        panic(err)
    }

}

func main() {
    c1 := "{" +
        `"mw" : 42.0922,` +
        `"?fH°gas" : {` +
        `   "value" : 372.38,` +
        `   "units" : "kJ/mol"` +
        `},` +
        `"S°gas" : {` +
        `   "value" : 216.81,` +
        `   "units" : "J/mol×K"` +
        `},` +
        `"index" : [` +
        `   {"name" : "mw", "value" …

如何使用 mongoengine 访问 ListField(DictField()) 并访问它，因为下面的代码不起作用？

from mongoengine import *

class Test():
    g = ListField(DictField(Mapping.build(
    test1=StringField(required=True),
    test2=StringField(required=True)
)))

我尝试将flask-wtf与下面的bootstrap-select结合起来，但我修改了TemplateSyntaxError：函数调用表达式的语法无效

<form class="form-inline" action="/" method="POST" role="form">
<div class="input-group"> 
  {{ form.hidden_tag() }}
  <span class="input-group-addon">Make:</span>
  {{ form.make(id="make_select", class="selectpicker form-control", data-live-search="true") }}
  <span class="input-group-addon">Model:</span>
  {{ form.model(id="model_select", class="selectpicker form-control", data-live-search="true") }}

  <span class="input-group-btn">
    <button class="btn btn-default" type="submit">Search!</button>
  </span>
</div>
</form>

。

TemplateSyntaxError: invalid syntax for function call expression
Traceback (most recent call last):
  File "/home/mic/.virtualenvs/unisnp/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
  File "/home/mic/.virtualenvs/unisnp/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
  File "/home/mic/.virtualenvs/unisnp/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, …

查看引导选择示例，不同的下拉菜单之间没有发生重叠。但是，在我的示例中，所有下拉菜单都重叠（演示）。

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="description" content="">
    <meta name="author" content="">

    <link rel="shortcut icon" href="../../docs-assets/ico/favicon.png">

    <title>TEST</title>


    <link rel="stylesheet" type="text/css" href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" >
    <link rel="stylesheet" type="text/css"href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.2/css/bootstrap-select.min.css">
    <link rel="stylesheet" href="/static/web.css">
    <link href="http://getbootstrap.com/examples/non-responsive/non-responsive.css" rel="stylesheet">

  </head>


  <body>

    <!-- Fixed navbar -->
    <div class="navbar navbar-default navbar-fixed-top" role="navigation">
      <div class="container">

        <div class="navbar-header">
          <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="/search/">TEST</a>
        </div>
        <div class="navbar-collapse collapse" id="navbar-collapsible">
          <ul class="nav …

我试图以下面的方式运行打字稿示例,导致以下错误:

$ mongod --dbpath /home/u/databases
$ npm install
$ tsc --sourcemap --module commonjs app.ts
$ node app.js                             
{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version
========================================================================================
=  Please ensure that you set the default write concern for the database by setting    =
=   one of the options                                                                 =
=                                                                                      =
=     w: (value of > -1 or the string 'majority'), where < 1 means                     =
= …

是否可以转换以下代码，使其使用defprotocol和defrecord代替defmultiand defmethod？

(defmulti test-multimethod (fn [keyword] keyword))

(defmethod test-multimethod :foo [a-map]
  "foo-method was called")

(defmethod test-multimethod :bar [a-map]
  "bar-method was called")

(defmulti perimeter (fn [shape] (:shape-name shape)))
(defmethod perimeter :circle [circle]
  (* 2 Math/PI (:radius circle)))
(defmethod perimeter :rectangle [rectangle]
  (+ (* 2 (:width rectangle)) (* 2 (:height rectangle))))

(def some-shapes [{:shape-name :circle :radius 4}
                   {:shape-name :rectangle :width 2 :height 2}])

(defmulti area (fn [shape] (:shape-name shape)))
(defmethod area :circle [circle]
  (* Math/PI …

我找到了SWTChart库,只是想知道如何用鼠标查看下面的图表,并获得有关y值的信息框,如本例所示.

一只忙碌的猫http://www.swtchart.org/screenshots/img/area.png

package org.swtchart.examples;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.swtchart.Chart;
import org.swtchart.ILineSeries;
import org.swtchart.ISeries.SeriesType;

/**
* An example for area chart.
*/
public class AreaChartExample {

    private static final double[] ySeries1 = { 0.1, 0.38, 0.71, 0.92, 1.0 };

    private static final double[] ySeries2 = { 1.2, 3.53, 3.1, 0.1, 0.5 };

    /**
    * The main method.
    * 
    * @param args
    *            the arguments
    */
    public static void main(String[] args) …

我想使用PyMongo的批量 写入操作功能,这些功能可以批量执行写操作,以减少网络往返次数并提高计算吞吐量.

我在这里也发现可以使用5000作为批号.

但是,我不希望批号的最佳大小以及如何在下面的代码中将PyMongo的批量写入操作功能与生成器结合起来？

from pymongo import MongoClient
from itertools import groupby
import csv


def iter_something(rows):
    key_names = ['type', 'name', 'sub_name', 'pos', 's_type', 'x_type']
    chr_key_names = ['letter', 'no']
    for keys, group in groupby(rows, lambda row: row[:6]):
        result = dict(zip(key_names, keys))
        result['chr'] = [dict(zip(chr_key_names, row[6:])) for row in group]
        yield result


def main():
    converters = [str, str, str, int, int, int, str, int]
    with open("/home/mic/tmp/test.txt") as c:
    reader = csv.reader(c, skipinitialspace=True)
    converted = ([conv(col) for conv, …

我写了以下代码：

for (count, x) in enumerate(["x1", "x1.y1", "x1.y1.xyz22", "x133001", "x133001.y1", "x133001.y1.xyz22"])
    print(x)
    print(" -> ") 
    println(count)
    split(x,".")[0]
end

为了将 ID 从左列更改为右列：

x1                 -> 1
x1.y1              -> 1.y1 
x1.y1.xyz22        -> 1.y1.xyz22
...
x133001            -> 22
x133001.y1         -> 22.y1
x133001.y1.xyz22   -> 22.y1.xyz22

不幸的是，我得到了ERROR: BoundsError: attempt to access 1-element Array{SubString{String},1} at index [0]。

我错过了什么？

先感谢您，

我不明白使用中有哪些优点或缺点let,因为可以避免在下面的代码中使用let？

(defn make-adder [x]
  (let [y x]
    (fn [z] (+ y z))))
(def add2 (make-adder 2))

;; or without let
(defn add2 [z] (+ 2 z))

(add2 4)