关于python：使用Python3.7的Flask-MySQLdb问题


Issues with Flask-MySQLdb using Python3.7

我的Flask Web服务器出现问题。 从flask_mysqldb添加后，我收到一条错误消息，将MySQL和SQL脚本导入源文件。 我收到此消息：

$ python app.py Traceback (most recent call last): File"app.py", line 3, in from flask_mysqldb import MySQL File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_mysqldb/init.py",
line 1, in import MySQLdb File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/MySQLdb/init.py",
line 18, in import _mysql ImportError:
dlopen(/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/_mysql.cpython-37m-darwin.so,
2): Library not loaded: @rpath/libmysqlclient.21.dylib Referenced
from:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/_mysql.cpython-37m-darwin.so
Reason: image not found**

我想知道是否与我使用python 3.7有关。 烧瓶mysqldb doc表示它支持Python 2.7、3.4和3.5。 我应该使用旧版本的python吗？ 您的投入非常多！

这是源代码：

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from flask import Flask, render_template, flash, redirect, url_for, session, request, logging
from data import Articles
from flask_mysqldb import MySQL
from wtforms import Form, StringField, TextAreaField, PasswordField, validators
from passlib.hash import sha256_crypt

app = Flask(__name__)

app.config['MYSQL_HOST'] = 'localhost'
app.config['MYSQL_USER'] = 'root'
app.config['MYSQL_PASSWORD'] = '123456'
app.config['MYSQL_DB'] = 'myflaskapp'
app.config['MYSQL_CURSORCLASS'] = 'DictCursor'

mysql = MySQL(app)

Articles = Articles()

@app.route("/")
@app.route("/home")
def home():
    return render_template('home.html')

@app.route('/about')
def about():
    return render_template('about.html')

@app.route('/articles')
def articles():
    return render_template('articles.html', articles = Articles)

@app.route('/article/<string:id>/')
def article(id):
    return render_template('article.html', id = id)

class RegisterForm(Form):
    name = StringField('Name', [validators.Length(min=1, max=50)])
    username = StringField('Username', [validators.Length(min=4, max=25)])
    email = StringField('Email', [validators.Length(min=6, max=50)])
    password = PasswordField('Password', [
            validators.DataRequired(),
            validators.EqualTo('Confirm', message='Passwords do not match')
        ])
    confirm = PasswordField('Confirm Password')

@app.route('/register', methods=['GET', 'POST'])
def register():
    form = RegisterForm(request.form)
    if request.method == 'POST' and form.validate():
        name = form.name.data
        email = form.email.data
        username = form.username.data
        password = sha256_crypt.encrypt(str(form.password.data))

        # Create cursor
        cur = mysql.connection.cursor()

        # Execute query
        cur.execute("INSERT INTO users(name, email, username, password) VALUES(%s, %s, %s, %s )", (name, email, username, password))

        #Commit to DB
        mysql.connection.commit()

        #close connection
        cur.close()

        flash('You are now registered and can now log in', 'success')

        redirect(url_for('index'))

    return render_template('register.html', form=form)

if __name__ == '__main__':
    app.run(debug=True)

我一直在遵循与您相同的编程教程，并且使用Python 3.7可以正常工作。 唯一的区别是我正在使用Linux，而您正在使用MacOS。 这里的问题不是Python 3.7。 相反，此代码段指示了该问题：

Library not loaded: @rpath/libmysqlclient.21.dylib Referenced from: /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/_mysql.cpython-37m-darwin.so Reason: image not found**

问题是MySQL软件包找不到另一个线程中讨论的动态库_mysql.cpython-37m-darwin.so。

动态库应该在/usr/local/mysql/lib目录中可用。 如果在该目录中，则只需使用以下命令修改$DYLD_LIBRARY_PATH变量：
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib/:$DYLD_LIBRARY_PATH。

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