Question

我正在处理一个烧瓶文件，我正在尝试将一些功能和方法放在一个单独的python文件中，以便更容易使用并创建一个仅用于我的功能的文件烧瓶应用。我已经查找了怎么做，但由于某种原因，它不与我合作，我希望有人可以帮助我。我有下面的文件片段和github链接。

github：https://github.com/omar-jandali/RoadTripWebsite

原始 init .py文件：

import modu
from flask import Flask, render_template, request, redirect, url_for, flash
from flask import escape, session
from datetime import datetime
from sqlalchemy import *
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from database_setup import Users, Groups, Records, Base

@app.route('/validate_registration', methods=['GET', 'POST'])
def Validate_Registration():
    usernameMinChars = 4
    usernameMaxChars = 12
    passwordMinChars = 8
    passwordMaxChars = 14

    if request.method == 'POST':

        # this is all of the fields in the form
        username = request.form['username']
        email = request.form['email']
        password = request.form['password']
        verify = request.form['verify']
        check_username = db_session.query(Users).filter_by(Username = username).\
                            first()
        check_email = db_session.query(Users).filter_by(Email = email).first()

        if username != None:
            if len(username) >= usernameMinChars:
                if len(username) <= usernameMaxChars:
                    if check_username == None:
                        valid_username = username
                    else:
                        flash('The username ' + username + ' is already in use')
                        return redirect(url_for('Registration'))
                else:
                    flash('The username is too long')
                    return redirect(url_for('Registration'))
            else:
                flash('The username is too short')
                return redirect(url_for('Registration'))
        else:
            flash('Youh ave to enter a username to register')
            return redirect(url_for('Registration'))

更改了服务器/ init .py文件（我想对其进行查询，以便我在另一个文件中调用def以验证用户名并在有效时提交用户名。）

替换：

if username != None:
            if len(username) >= usernameMinChars:
                if len(username) <= usernameMaxChars:
                    if check_username == None:
                        valid_username = username
                    else:
                        flash('The username ' + username + ' is already in use')
                        return redirect(url_for('Registration'))
                else:
                    flash('The username is too long')
                    return redirect(url_for('Registration'))
            else:
                flash('The username is too short')
                return redirect(url_for('Registration'))
        else:
            flash('Youh ave to enter a username to register')
            return redirect(url_for('Registration'))

使用：

valid_username = modu.ValidateUsername(check_username)

**我在 init .py文件顶部导入的同一文件目录中添加了一个名为modu的新文件

这是为了保存所有defs而创建的modu.py文件，可以在需要时由 init .py文件调用：

from flask import Flask, render_template, request, redirect, url_for, flash
from flask import escape, session
from datetime import datetime
from sqlalchemy import *
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from database_setup import Users, Groups, Records, Base


    def ValidateUsername(username):
        if username != None:
            if len(username) >= usernameMinChars:
                if len(username) <= usernameMaxChars:
                    if check_username == None:
                        valid_username = username
                        return valid_username
                    else:
                        flash('The username ' + username + ' is already in use')
                        return redirect(url_for('Registration'))
                else:
                    flash('The username is too long')
                    return redirect(url_for('Registration'))
            else:
                flash('The username is too short')
                return redirect(url_for('Registration'))
        else:
            flash('Youh ave to enter a username to register')
            return redirect(url_for('Registration'))

Answer 1

首先，当你不必

时，不要试图嵌套东西

其次，你试图返回两个不同的对象，所以你需要抓住那个

def is_valid_user(username):
    go_register = False 
    if not username:
        flash('You have to enter a username to register')
        go_register = True

    if len(username) >= usernameMinChars:
        flash('The username is too long')
        go_register = True
    if len(username) <= usernameMaxChars:
        flash('The username is too short')
       go_register = True

    if not check_username:
        flash('The username ' + username + ' is already in use')
        go_register = True

    # return two items, a redirect and the username
    if go_register:
        return redirect(url_for('Registration')), None 

    # If there was no error, you don't redirect
    return None, username

例如，

go_register, valid_username = is_valid_user(username)
if go_register:
    return go_register 
else:
    flash("valid " + valid_username)

将flask功能移动到单独的文件

1 个答案: