ModuleNotFoundError：即使已安装，也没有名为“flask_mysqldb”的模块

Posted 2023-05-09

【中文标题】ModuleNotFoundError：即使已安装，也没有名为“flask_mysqldb”的模块

【英文标题】：ModuleNotFoundError: No module named 'flask_mysqldb' even if installed

【发布时间】：2021-01-27 13:25:34

【问题描述】：

我正在使用 mysql 和烧瓶来开发基本网站，即使我安装了模块，我也会收到 ModuleNotFound 错误。有人可以解决这个问题吗？

  File "c:/Users/prshi/Desktop/Py files/FLASK app/app.py", line 3, in <module>
    from flask_mysqldb import MySQL
ModuleNotFoundError: No module named 'flask_mysqldb'
PS C:\Users\prshi\Desktop\Py files\FLASK app> pip install flask-mysqldb
Requirement already satisfied: flask-mysqldb in c:\python39\lib\site-packages (0.2.0)
Requirement already satisfied: Flask>=0.10 in c:\python39\lib\site-packages (from flask-mysqldb) (1.1.2)
Requirement already satisfied: mysqlclient in c:\python39\lib\site-packages (from flask-mysqldb) (1.4.6)
Requirement already satisfied: Werkzeug>=0.15 in c:\python39\lib\site-packages (from Flask>=0.10->flask-mysqldb) (1.0.1)
Requirement already satisfied: Jinja2>=2.10.1 in c:\python39\lib\site-packages (from Flask>=0.10->flask-mysqldb) (2.11.2)
Requirement already satisfied: itsdangerous>=0.24 in c:\python39\lib\site-packages (from Flask>=0.10->flask-mysqldb) (1.1.0)
Requirement already satisfied: click>=5.1 in c:\python39\lib\site-packages (from Flask>=0.10->flask-mysqldb) (7.1.2)
Requirement already satisfied: MarkupSafe>=0.23 in c:\python39\lib\site-packages (from Jinja2>=2.10.1->Flask>=0.10->flask-mysqldb) (1.1.1)
PS C:\Users\prshi\Desktop\Py files\FLASK app> 

【参考方案1】：

这是一个常见的 python 路径问题，为确保不是您的情况，请键入：

import sys
print(sys.path)

并检查它是否包含：

/usr/local/lib64/python3.6/site-packages

问题是您在某处使用 pip 安装了该软件包，并且您试图从其他未安装它的地方导入它。解决它的诀窍是运行以下命令：

export PYTHONPATH=$PYTHONPATH:/path/to/your/modules 

【讨论】：

嘿，是的，它确实包含站点包

太好了，现在导出命令解决了您的问题吗？如果你想更清楚地解释为什么会这样，我推荐PYTHONPATH tip