小编Ant*_*ony的帖子

虽然这个问题在实践中没有任何实际用途,但我很好奇Python如何进行字符串实习.我注意到以下内容.

>> "string" is "string"
>> True

这是我所期待的.

你也可以这样做.

>> "strin"+"g" is "string"
>> True

这非常聪明!

但你不能这样做.

>> s1 = "strin"
>> s2 = "string"
>> s1+"g" is s2
>> False

为什么Python不会评估s1+"g",意识到它是相同的s1并指向同一个地址？在最后一个块中实际发生了什么让它返回False？

当用户访问我的Flask应用程序中的页面时,我想增加一个计数器.如果两个用户访问该页面,则计数应增加2.我尝试了以下但计数始终为1.如何增加每次访问的值？

@app.route('/count')
def make_count():
    count = 0
    value = count + 1
    return jsonify(count=value)

我正在尝试将Webpack集成到我的Django项目中.

这是我的webpack.config.js文件:

const path = require("path");
const webpack = require('webpack');
const BundleTracker = require('webpack-bundle-tracker');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

const VENDOR_LIBS = [
    'jquery', 'mustache'
];

const config = {
    context: __dirname,
    entry:  {
        app: 'app.js',
        vendor: VENDOR_LIBS,
    },
    output: {
        path: path.resolve(__dirname, './static/bundles/'),
        filename: "[name].js"
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['env']
                    }
                }
            },
            {
                test: /\.css$/,
                use: ExtractTextPlugin.extract({
                    fallback: "style-loader",
                    use: "css-loader"
                })
            },
            {
                test: /\.(jpe?g|png|gif|svg)$/, …

我升级到react-scripts v5，并且收到以下错误：

这是我的导入基于Swiper 文档的样子：

import { Swiper, SwiperSlide } from 'swiper/react/swiper-react';

import 'swiper/swiper-bundle.min.css';
import 'swiper/swiper.min.css';

这是我的 webpack.config.js 文件：

const path = require('path');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');

const config = {
    entry: {
        bundle: './javascript/index.js'
    },
    output: {
        path: path.resolve(__dirname, 'build'),
        filename: '[name].[chunkhash].js'
    },
    module: {
        rules: [
            {
                use: 'babel-loader',
                test: /\.js$/,
                exclude: /node_modules/
            },
            {
                test: /\.css$/,
                use: ExtractTextPlugin.extract({
                    fallback: "style-loader",
                    use: "css-loader"
                })
            },
            {
                test: /\.(jpe?g|png|gif|svg)$/,
                use: [
                    {
                        loader: 'url-loader',
                        options: {
                            limit: 40000
                        }
                    },
                    'image-webpack-loader'
                ]
            }
        ]
    },
    plugins: [
        new ExtractTextPlugin('style.css'),
        new HtmlWebpackPlugin({ …

我正在开发这个网络应用程序，它允许人们登录，并能够创建：用户、创建啤酒和对不同类型啤酒的评论。

这是我用于创建啤酒的models.py：

from django.db import models
from django.conf import settings

# Models

User = settings.AUTH_USER_MODEL

class BeerModel(models.Model):

    user = models.ForeignKey(User, default=1)
    name = models.CharField(max_length=254, default="")
    style = models.CharField(max_length=254, default="")
    ibu = models.IntegerField(default="")
    calories = models.IntegerField(default="")
    abv = models.IntegerField(default="")
    location = models.CharField(max_length=254, default="")

    class Meta:
        verbose_name_plural = 'Beers'

    def __str__(self):
        return self.name

    def avg(self):
        return

这是我的forms.py：

from django import forms
from django.contrib.auth.models import User
from .models import BeerModel, RateModel

# Forms

class UserForm(forms.ModelForm):
    password = forms.CharField(widget=forms.PasswordInput())

    class Meta:
        model = User …

是否可以简化此操作：

def method(self, **kwargs):
    if kwargs.get('profile_id') is None:
        kwargs['profile_id'] = 'something1'
    if kwargs.get('status') is None:
        kwargs['status'] = 'something2'
    if kwargs.get('account_type') is None:
        kwargs['account_type'] = 'something3'
    if kwargs.get('external_account_id') is None:
        kwargs['external_account_id'] = 'something4'
    if kwargs.get('vendor') is None:
        kwargs['vendor'] = 'something5'
    if kwargs.get('created_timestamp') is None:
        kwargs['created_timestamp'] = 'something6'

    return ClassOne.objects.create(**kwargs)

这行得通，但是我只是好奇是否还有更优雅的东西。我正在考虑做这样的事情：

kwargs['profile_id'] = kwargs.get('profile_id') or 'something1'