python - 成功安装flask，仍然出现导入错误

Question

我第一次使用 Flask 和 Python 尝试创建一个 Web 应用程序。我在 Windows 10 上使用 Cygwin；由于某种原因，即使我已经使用 pip 成功安装了 Flask:

$ pip install flask
Requirement already satisfied (use --upgrade to upgrade): flask in c:\python34\l                                                                                                                ib\site-packages
Requirement already satisfied (use --upgrade to upgrade): click>=2.0 in c:\pytho                                                                                                                n34\lib\site-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): Jinja2>=2.4 in c:\pyth                                                                                                                on34\lib\site-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): itsdangerous>=0.21 in                                                                                                                 c:\python34\lib\site-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): Werkzeug>=0.7 in c:\py                                                                                                                thon34\lib\site-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): MarkupSafe>=0.23 in c:                                                                                                                \python34\lib\site-packages (from Jinja2>=2.4->flask)
You are using pip version 7.1.2, however version 9.0.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' comm                                                                                                             and.

运行 python app.py 时仍然出现此错误:

$ python app.py
Traceback (most recent call last):
  File "app.py", line 1, in <module>
    from flask import Flask
ImportError: No module named flask

有什么想法吗？抱歉，如果这是一个愚蠢的问题，这是一个很新的问题。

Answer 1

如果您不想使用 virtualenv，请尝试此操作:

python -m pip install --upgrade pip
python -m pip install flask