使用Python3.7的MySQLdb中的问题

Question

我遇到了一个问题，我的烧瓶web服务器。一旦我将从flask_mysqldb导入MySQL以及SQL脚本添加到源文件中，就会收到一条错误消息。我收到这样的信息：

$ python app.py跟踪(最近一次调用)：文件"app.py"，第3行，在flask_mysqldb导入MySQL文件的第1行，在导入MySQLdb文件的第18行，在导入dlopen(/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/_mysql.cpython-37m-darwin.so，2)：库未加载：@rpath/libmysqlclient.21.dylib引用: /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/_mysql.cpython-37m-darwin.so原因:图像未找到**

我想知道这是否与我使用python3.7有关。烧瓶mysqldb文档表示它支持Python2.7、3.4和3.5。我应该使用较早版本的python吗？你的投入是很多学徒！

这里是源代码：

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)

Answer 1

我一直在遵循与您和我一样的编程教程，使用Python3.7完成所有操作。唯一的区别是，我使用的是Linux，而您使用的是MacOS。这里的问题不是Python3.7。相反，这个问题是由以下代码片段指出的：

库未加载：@rpath/libmysqlclient.21.dylib引用自: /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/_mysql.cpython-37m-darwin.so原因:图像未找到**

问题是，MySQL包无法找到another thread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。如果它位于该目录中，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。