Python 导入错误：没有名为烧瓶的模块
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ImportError: No module named flask
提问by leandrotk
I installed virtualenv, activated it, and installed flask. So I have three folders: Include, Scripts and Lib. This last folder contains the site-packages folder, that contains flask folder.
我安装了 virtualenv，激活它，并安装了 Flask。所以我有三个文件夹：Include、Scripts 和 Lib。最后一个文件夹包含 site-packages 文件夹，其中包含 Flask 文件夹。
If I put my app.py (simple Hello World app) inside "site-packages" folder, I don't get this error. But if put out of this three folder, but inside my flask_environment, I get this error.
如果我将 app.py（简单的 Hello World 应用程序）放在“site-packages”文件夹中，则不会出现此错误。但是如果把这三个文件夹放在外面，但是在我的flask_environment里面，我会得到这个错误。
Is something going wrong here?
这里有什么问题吗？
The error:
错误：
Traceback (most recent call last):
File "C:\Flask\flask_env\app.py", line 3, in <module>
from flask import Flask
ImportError: No module named flask
回答by Dhananjay
Please make sure you have activated virtual environment before running python file.
在运行 python 文件之前，请确保您已激活虚拟环境。
. venv/bin/activate
回答by Najeebullah Shah
check this stack answer, only instead of pika you have to type flask:
检查这个堆栈答案，只有你必须输入flask而不是pika：
回答by FrozZerrer
If you are using python3 you have to change a little bit your wsgi file.
如果您使用的是 python3，则必须稍微更改您的 wsgi 文件。
I changed my xx.wsgi from using execfile() to using exec(). Here is what it looks like when it finally worked.
我将 xx.wsgi 从使用 execfile() 更改为使用 exec()。这是它最终工作时的样子。
activate_this = '/opt/flask/project_name/py3venv/bin/activate_this.py'
exec(open(activate_this).read(), dict(__file__=activate_this))
import sys
sys.path.insert(0, '/opt/flask/project_name')
from project_app_name import app as application
回答by ablshk
try this command in the terminal instead of selecting 'run code':
在终端中尝试此命令，而不是选择“运行代码”：
python3 'insert your file name here without the quotes'
回答by F.A. SULAIMAN
run as python3 <file_name>
运行方式 python3 <file_name>
EX: python3 api.py
例如：python3 api.py
