已安装模块时获取 flask 无法导入 flask-mysqldb 错误

Question

我试图从 this 教程中学习 link 使用 MySQL 数据库的烧瓶。

我使用 pip3 安装 flask-mysqldb 到我的虚拟环境中，这是成功的。

有一些答案，但它们都涵盖了 fail to install flask-mysqldb 在我的情况下，安装本身是成功的，但我仍然在网页上收到错误。

当我使用 flask run 启动服务器并尝试运行路由 URL localhost:5000/ 进入浏览器时，我收到 [=12 的导入错误=].

这正是我得到的错误：

flask.cli.NoAppException: While importing "todo_app", an ImportError was raised:

File "/home/shubham/venv/lib/python3.6/site-packages/flask/cli.py", line 240, in locate_app
__import__(module_name)

File "/home/shubham/repos/academy-hackathon/week-0/day-3/my_todo_app/todo_app/app.py", line 7, in <module> 
from flask_mysqldb import MySQL 

File "/home/shubham/venv/lib/python3.6/site-packages/flask_mysqldb/__init__.py", line 1, in <module> 
import MySQLdb 

File "/home/shubham/venv/lib/python3.6/site-packages/MySQLdb/__init__.py", line 18, in <module> 
from . import _mysql 

ImportError: libmysqlclient.so.18: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/shubham/venv/lib/python3.6/site-packages/flask/cli.py", line 338, in __call__
    self._flush_bg_loading_exception()
  File "/home/shubham/venv/lib/python3.6/site-packages/flask/cli.py", line 326, in _flush_bg_loading_exception
    reraise(*exc_info)
  File "/home/shubham/venv/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/shubham/venv/lib/python3.6/site-packages/flask/cli.py", line 314, in _load_app
    self._load_unlocked()
  File "/home/shubham/venv/lib/python3.6/site-packages/flask/cli.py", line 330, in _load_unlocked
    self._app = rv = self.loader()
  File "/home/shubham/venv/lib/python3.6/site-packages/flask/cli.py", line 388, in load_app
    app = locate_app(self, import_name, name)
  File "/home/shubham/venv/lib/python3.6/site-packages/flask/cli.py", line 247, in locate_app
    "\n\n{tb}".format(name=module_name, tb=traceback.format_exc())
flask.cli.NoAppException: While importing "app", an ImportError was raised:

Traceback (most recent call last):
  File "/home/shubham/venv/lib/python3.6/site-packages/flask/cli.py", line 240, in locate_app
    __import__(module_name)
  File "/home/shubham/repos/academy-hackathon/week-0/day-3/my_todo_app/todo_app/app.py", line 7, in <module>
    from flask_mysqldb import MySQL
  File "/home/shubham/venv/lib/python3.6/site-packages/flask_mysqldb/__init__.py", line 1, in <module>
    import MySQLdb
  File "/home/shubham/venv/lib/python3.6/site-packages/MySQLdb/__init__.py", line 18, in <module>
    from . import _mysql
ImportError: libmysqlclient.so.18: cannot open shared object file: No such file or directory

venv 是 python 环境的名称

我不确定为什么会出现此错误，我正在从安装模块 flask-mysqldb.[=24 的同一 python 环境中运行连接服务器=]

此外，我在 'base' 命名环境中的机器上安装了 anaconda-navigator 我尝试使用 conda install flask-mysqldb 安装模块，但它没有显示模块错误。那么有没有可能是conda环境导致的错误呢？

请提出任何解决方案，从昨晚开始一直停留在这个问题上。

编辑：我发现安装 MySQL-python 应该可以解决这个问题，但是我在安装 MySQL-python

时遇到另一个错误

Collecting MySQL-python
  Using cached https://files.pythonhosted.org/packages/a5/e9/51b544da85a36a68debe7a7091f068d802fc515a3a202652828c73453cad/MySQL-python-1.2.5.zip
    ERROR: Complete output from command python setup.py egg_info:
    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-9zyrtdz5/MySQL-python/setup.py", line 13, in <module>
        from setup_posix import get_config
      File "/tmp/pip-install-9zyrtdz5/MySQL-python/setup_posix.py", line 2, in <module>
        from ConfigParser import SafeConfigParser
    ModuleNotFoundError: No module named 'ConfigParser'
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-9zyrtdz5/MySQL-python/

Answer 1

以同样的顺序试试这个

sudo apt install python3.6-dev libpython3.6-dev
sudo apt-get install mysql-server
virtualenv -p python3.6 venv
source venv/bin/activate
pip3 install flask
pip3 install flask-mysqldb

然后创建 app.py

from flask import Flask

app = Flask(__name__)


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

然后执行app模块

python app.py

Answer 2

首先，安装Flask-MySQLdb：

$ pip install flask-mysqldb

Flask-MySQLdb 取决于并将为您安装最新版本的 Flask（0.12.4 或更高版本）和 mysqlclient。 Flask-MySQLdb 与 Python 2.7、3.5、3.6 和 3.7 兼容并经过测试。

接下来，将 MySQL 实例添加到您的代码中：

from flask import Flask
from flask_mysqldb import MySQL

..根据提供的信息 - here.

link 到文档 - here.

已安装模块时获取 flask 无法导入 flask-mysqldb 错误

Getting flask fail to import error for flask-mysqldb when the module is already installed

python

mysql

python-module

flask