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Python 导入错误 - 没有模块

tag-icon • tag-icon python flask
Python 导入错误 - 没有模块

抱歉，这是基础问题。我按照一个相当简单的教程操作，在本地运行 flask 时出现此错误：

Traceback (most recent call last):
  File "/Users/james/opt/anaconda3/lib/python3.8/site-packages/flask/cli.py", line 240, in locate_app
    __import__(module_name)
  File "/Users/james/Documents/GitHub/flask-app-blueprint/project/__init__.py", line 3, in <module>
    from flask_sqlalchemy import SQLAlchemy
ModuleNotFoundError: No module named 'flask_sqlalchemy'

然而，在相同的环境中，当我运行 pip list 时，它告诉我有该模块：Flask-SQLAlchemy 2.2

(venv) (base) james flask-app-blueprint % pip3 install flask-sqlalchemy
Requirement already satisfied: flask-sqlalchemy in ./venv/lib/python3.8/site-packages (2.5.1)
Requirement already satisfied: Flask>=0.10 in ./venv/lib/python3.8/site-packages (from flask-sqlalchemy) (1.0.2)
Requirement already satisfied: SQLAlchemy>=0.8.0 in ./venv/lib/python3.8/site-packages (from flask-sqlalchemy) (1.3.3)
Requirement already satisfied: Jinja2>=2.10 in ./venv/lib/python3.8/site-packages (from Flask>=0.10->flask-sqlalchemy) (2.11.3)
Requirement already satisfied: itsdangerous>=0.24 in ./venv/lib/python3.8/site-packages (from Flask>=0.10->flask-sqlalchemy) (0.24)
Requirement already satisfied: Werkzeug>=0.14 in ./venv/lib/python3.8/site-packages (from Flask>=0.10->flask-sqlalchemy) (2.0.1)
Requirement already satisfied: click>=5.1 in ./venv/lib/python3.8/site-packages (from Flask>=0.10->flask-sqlalchemy) (7.0)
Requirement already satisfied: MarkupSafe>=0.23 in ./venv/lib/python3.8/site-packages (from Jinja2>=2.10->Flask>=0.10->flask-sqlalchemy) (2.0.1)

最重要的是，根据我所看到的内容，我文件中的代码看起来是正确的：

# IMPORTS
from flask import Flask, render_template
from flask_sqlalchemy import SQLAlchemy

我可能哪里做错了？

答案1

问题似乎是，当你运行你的 flask 脚本时，它使用的环境（anaconda）没有flask_sqlalchemy安装该包，这导致脚本失败，但是当你检查它是否安装时，你是在venv确实安装了它的虚拟环境中执行此操作的。

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