尝试安装 Flask 0.9 后的警告和错误答案

【问题标题】：Warnings and errors after trying to install Flask 0.9尝试安装 Flask 0.9 后的警告和错误
【发布时间】：2012-10-22 15:46:20
【问题描述】：

我正在尝试安装 Flask，但我赌的是所有这些警告和错误：

alex@alex-K43U:~/flask$ pip install Flask
Downloading/unpacking Flask
  Downloading Flask-0.9.tar.gz (481Kb): 481Kb downloaded
  Running setup.py egg_info for package Flask

    warning: no files found matching '*' under directory 'tests'
    warning: no previously-included files matching '*.pyc' found under directory 'docs'
    warning: no previously-included files matching '*.pyo' found under directory 'docs'
    warning: no previously-included files matching '*.pyc' found under directory 'tests'
    warning: no previously-included files matching '*.pyo' found under directory 'tests'
    warning: no previously-included files matching '*.pyc' found under directory 'examples'
    warning: no previously-included files matching '*.pyo' found under directory 'examples'
    no previously-included directories found matching 'docs/_build'
    no previously-included directories found matching 'docs/_themes/.git'
Downloading/unpacking Werkzeug>=0.7 (from Flask)
  Downloading Werkzeug-0.8.3.tar.gz (1.1Mb): 1.1Mb downloaded
  Running setup.py egg_info for package Werkzeug

    warning: no files found matching '*' under directory 'werkzeug/debug/templates'
    warning: no files found matching '*' under directory 'tests'
    warning: no previously-included files matching '*.pyc' found under directory 'docs'
    warning: no previously-included files matching '*.pyo' found under directory 'docs'
    warning: no previously-included files matching '*.pyc' found under directory 'tests'
    warning: no previously-included files matching '*.pyo' found under directory 'tests'
    warning: no previously-included files matching '*.pyc' found under directory 'examples'
    warning: no previously-included files matching '*.pyo' found under directory 'examples'
    no previously-included directories found matching 'docs/_build'
Downloading/unpacking Jinja2>=2.4 (from Flask)
  Downloading Jinja2-2.6.tar.gz (389Kb): 389Kb downloaded
  Running setup.py egg_info for package Jinja2

    warning: no previously-included files matching '*' found under directory 'docs/_build'
    warning: no previously-included files matching '*.pyc' found under directory 'jinja2'
    warning: no previously-included files matching '*.pyc' found under directory 'docs'
    warning: no previously-included files matching '*.pyo' found under directory 'jinja2'
    warning: no previously-included files matching '*.pyo' found under directory 'docs'
Installing collected packages: Flask, Werkzeug, Jinja2
  Running setup.py install for Flask

    warning: no files found matching '*' under directory 'tests'
    warning: no previously-included files matching '*.pyc' found under directory 'docs'
    warning: no previously-included files matching '*.pyo' found under directory 'docs'
    warning: no previously-included files matching '*.pyc' found under directory 'tests'
    warning: no previously-included files matching '*.pyo' found under directory 'tests'
    warning: no previously-included files matching '*.pyc' found under directory 'examples'
    warning: no previously-included files matching '*.pyo' found under directory 'examples'
    no previously-included directories found matching 'docs/_build'
    no previously-included directories found matching 'docs/_themes/.git'
    error: could not create '/usr/local/lib/python2.7/dist-packages/flask': Permission denied
    Complete output from command /usr/bin/python -c "import setuptools;__file__='/home/alex/flask/build/Flask/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-KD7NsY-record/install-record.txt:
    running install

running build

(a lot of creating and building)

error: could not create '/usr/local/lib/python2.7/dist-packages/flask': Permission denied

有解决这个问题的建议吗？

我使用的是 ubuntu 11.10。

【问题讨论】：

标签： python installation flask

【解决方案1】：

您可以放心忽略的警告；但是这个错误：

error: could not create '/usr/local/lib/python2.7/dist-packages/flask': Permission denied

告诉我你正试图将它安装到你的全局系统 Python 中。这没有错，但如果你想这样做，你需要以提升的权限运行命令（使用sudo）。

最好使用virtual environment，以免污染系统范围的 Python 安装。

使用虚拟环境：

$ virtualenv flask_env
$ source flask_env/bin/activate
(flask_env) $ pip install Flask

您可能应该首先使用 sudo apt-get install python-virtualenv 安装 virtualenv 二进制文件

【讨论】：

哇，非常感谢。官方文档里怎么没有？顺便问一下，我该如何退出virtualev(flask_env)alex@alex-K43U:~$？
这对我有用。不要在 ubuntu.(flask_env) $ sudo pip install Flask 中使用 sudo int virtualenv。我发现 sudo 在 mac osx 中可以，但在 ubuntu 中不工作

【解决方案2】：

至于警告，有时可以忽略。唯一相关的行是最后一行，它表示应用程序无权在该文件夹中创建目录。

将sudo 添加到您的命令以解决此问题。

sudo pip install Flask

作为一般规则，您不想在系统范围内安装软件包。在 Python 世界中，规范是使用虚拟环境来创建本地环境，并将包安装到每个环境中。你可以在virtualenvhere找到更多信息。

【讨论】：