falied在windows下的virutalenv下安装烧瓶 - [错误2]系统找不到指定的文件

Question

我在windows box上使用python 2.7.我可以使用pip install安装flask,如下所示:

但是,在我创建了virtualenv后,我在尝试做同样的事情时得到了以下错误.

脚本:

$pip install virtualenv  
$cd /d d:
$mkdir test
$cd test
$virtualenv  flaskEnv
$cd flaskEnv/Scritps/
$activate
$cd ../../
$pip install flask

日志文件如下:

Collecting flask
  Using cached Flask-0.11.1-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): click>=2.0 in c:\projects\flask-react\flsk\lib\site-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): Werkzeug>=0.7 in c:\projects\flask-react\flsk\lib\site-packages (from flask)
Collecting Jinja2>=2.4 (from flask)
  Using cached Jinja2-2.8-py2.py3-none-any.whl
Collecting itsdangerous>=0.21 (from flask)
Collecting MarkupSafe (from Jinja2>=2.4->flask)
  Using cached MarkupSafe-0.23.tar.gz
Building wheels for collected packages: MarkupSafe
  Running setup.py bdist_wheel for MarkupSafe: started
  Running setup.py bdist_wheel for MarkupSafe: finished with status 'error'
  Complete output from command c:\projects\flask-react\flsk\scripts\python.exe -u -c "import setuptools, tokenize;__file__='c:\\users\\admini~1\\appdata\\local\\temp\\pip-build-3ep417\\MarkupSafe\\setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d c:\users\admini~1\appdata\local\temp\tmp8mkr70pip-wheel- --python-tag cp27:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build\lib.win32-2.7
  creating build\lib.win32-2.7\markupsafe
  copying markupsafe\tests.py -> build\lib.win32-2.7\markupsafe
  copying markupsafe\_compat.py -> build\lib.win32-2.7\markupsafe
  copying markupsafe\_constants.py -> build\lib.win32-2.7\markupsafe
  copying markupsafe\_native.py -> build\lib.win32-2.7\markupsafe
  copying markupsafe\__init__.py -> build\lib.win32-2.7\markupsafe
  running egg_info
  writing MarkupSafe.egg-info\PKG-INFO
  writing top-level names to MarkupSafe.egg-info\top_level.txt
  writing dependency_links to MarkupSafe.egg-info\dependency_links.txt
  warning: manifest_maker: standard file '-c' not found

  reading manifest file 'MarkupSafe.egg-info\SOURCES.txt'
  reading manifest template 'MANIFEST.in'
  writing manifest file 'MarkupSafe.egg-info\SOURCES.txt'
  copying markupsafe\_speedups.c -> build\lib.win32-2.7\markupsafe
  running build_ext
  building 'markupsafe._speedups' extension
  error: [Error 2] The system cannot find the file specified

  ----------------------------------------
  Running setup.py clean for MarkupSafe
Failed to build MarkupSafe
Installing collected packages: MarkupSafe, Jinja2, itsdangerous, flask
  Running setup.py install for MarkupSafe: started
    Running setup.py install for MarkupSafe: finished with status 'error'
    Complete output from command c:\projects\flask-react\flsk\scripts\python.exe -u -c "import setuptools, tokenize;__file__='c:\\users\\admini~1\\appdata\\local\\temp\\pip-build-3ep417\\MarkupSafe\\setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record c:\users\admini~1\appdata\local\temp\pip-8v3_ep-record\install-record.txt --single-version-externally-managed --compile --install-headers c:\projects\flask-react\flsk\include\site\python2.7\MarkupSafe:
    running install
    running build
    running build_py
    creating build
    creating build\lib.win32-2.7
    creating build\lib.win32-2.7\markupsafe
    copying markupsafe\tests.py -> build\lib.win32-2.7\markupsafe
    copying markupsafe\_compat.py -> build\lib.win32-2.7\markupsafe
    copying markupsafe\_constants.py -> build\lib.win32-2.7\markupsafe
    copying markupsafe\_native.py -> build\lib.win32-2.7\markupsafe
    copying markupsafe\__init__.py -> build\lib.win32-2.7\markupsafe
    running egg_info
    writing MarkupSafe.egg-info\PKG-INFO
    writing top-level names to MarkupSafe.egg-info\top_level.txt
    writing dependency_links to MarkupSafe.egg-info\dependency_links.txt
    warning: manifest_maker: standard file '-c' not found

    reading manifest file 'MarkupSafe.egg-info\SOURCES.txt'
    reading manifest template 'MANIFEST.in'
    writing manifest file 'MarkupSafe.egg-info\SOURCES.txt'
    copying markupsafe\_speedups.c -> build\lib.win32-2.7\markupsafe
    running build_ext
    building 'markupsafe._speedups' extension
    error: [Error 2] The system cannot find the file specified

错误消息对任何人都有意义吗？谢谢

Answer 1

此问题似乎与您的virtualenv中安装的setuptools版本有关.降级到旧版本为我修复了它.

从你的virtualenv:

pip install setuptools==21.2.1
pip install flask

Answer 2

我昨天遇到了这个问题.我通过下载MarkupSafe 轮并使用pip安装解决了这个问题.问题在于我的头脑.关于编译器标志的一些事情,以便在生成Speedups文件时抑制错误,我想.

1)从上面的链接下载车轮.

2)在Windows上,在与滚轮相同的目录中打开命令窗口.

3)运行"pip Install"

Answer 3

好的。我明白了。我不认为我安装 Flask 的方式有什么问题，正如我在问题中已经提到的，我可以全局安装它（无需在 virtualenv 中运行）。MarkupSafe 包有一个使用 c 实现的扩展，并且我的本地计算机上没有安装 Windows sdk，因此当 ve_build_ext 运行时，**** 它总是失败 **

区别在于 if not (is_pypy or is_jython) ，它会发出警告，这就是我在全局安装它时得到的警告；但是，在 virtualenv 下运行时它会崩溃。所以我很确定 hasattr(sys, 'pypy_version_info') 在 vi​​rtualenv 下运行时返回 true。

有人知道“hasattr(sys, 'pypy_version_info')”是什么意思吗？

# fail safe compilation shamelessly stolen from the simplejson
# setup.py file.  Original author: Bob Ippolito

is_jython = 'java' in sys.platform
is_pypy = hasattr(sys, 'pypy_version_info')


def run_setup(with_binary):
ext = Extension('markupsafe._speedups', ['markupsafe/_speedups.c'])
ext_modules = [ext] if with_binary else []




def try_building_extension():
    try:
        run_setup(True)
    except BuildFailed:
        LINE = '=' * 74
        BUILD_EXT_WARNING = 'WARNING: The C extension could not be ' \
                            'compiled, speedups are not enabled.'
    echo(LINE)
    echo(BUILD_EXT_WARNING)
    echo('Failure information, if any, is above.')
    echo('Retrying the build without the C extension now.')
    echo()

    run_setup(False)

    echo(LINE)
    echo(BUILD_EXT_WARNING)
    echo('Plain-Python installation succeeded.')
    echo(LINE)

如果不是（is_pypy 或 is_jython）：try_building_extension() 否则：run_setup(False)