Unable to install Flask-Mail

问题

I am trying to send an email using Flask when a user registers on my website. I used the command pip install Flask-Mail to install. However, I get the following error of possible version mismatch:

  Downloading/unpacking Flask-mail
  Downloading Flask-Mail-0.9.1.tar.gz (45kB): 45kB downloaded
  Running setup.py (path:/tmp/pip_build_root/Flask-mail/setup.py) egg_info for package Flask-mail
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/tmp/pip_build_root/Flask-mail/setup.py", line 52, in <module>
        'Topic :: Software Development :: Libraries :: Python Modules'
      File "/usr/lib/python2.7/distutils/core.py", line 111, in setup
        _setup_distribution = dist = klass(attrs)
      File "/usr/local/lib/python2.7/dist-packages/distribute-0.6.28-py2.7.egg/setuptools/dist.py", line 225, in __init__
        _Distribution.__init__(self,attrs)
      File "/usr/lib/python2.7/distutils/dist.py", line 287, in __init__
        self.finalize_options()
      File "/usr/local/lib/python2.7/dist-packages/distribute-0.6.28-py2.7.egg/setuptools/dist.py", line 257, in finalize_options
        ep.require(installer=self.fetch_build_egg)
      File "/usr/local/lib/python2.7/dist-packages/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 2029, in require
        working_set.resolve(self.dist.requires(self.extras),env,installer))
      File "/usr/local/lib/python2.7/dist-packages/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 592, in resolve
        raise VersionConflict(dist,req) # XXX put more info here
    pkg_resources.VersionConflict: (certifi 2016.2.28 (/usr/local/lib/python2.7/dist-packages), Requirement.parse('certifi==2015.11.20'))
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/tmp/pip_build_root/Flask-mail/setup.py", line 52, in <module>

    'Topic :: Software Development :: Libraries :: Python Modules'

  File "/usr/lib/python2.7/distutils/core.py", line 111, in setup

    _setup_distribution = dist = klass(attrs)

  File "/usr/local/lib/python2.7/dist-packages/distribute-0.6.28-py2.7.egg/setuptools/dist.py", line 225, in __init__

    _Distribution.__init__(self,attrs)

  File "/usr/lib/python2.7/distutils/dist.py", line 287, in __init__

    self.finalize_options()

  File "/usr/local/lib/python2.7/dist-packages/distribute-0.6.28-py2.7.egg/setuptools/dist.py", line 257, in finalize_options

    ep.require(installer=self.fetch_build_egg)

  File "/usr/local/lib/python2.7/dist-packages/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 2029, in require

    working_set.resolve(self.dist.requires(self.extras),env,installer))

  File "/usr/local/lib/python2.7/dist-packages/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 592, in resolve

    raise VersionConflict(dist,req) # XXX put more info here

pkg_resources.VersionConflict: (certifi 2016.2.28 (/usr/local/lib/python2.7/dist-packages), Requirement.parse('certifi==2015.11.20'))

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_root/Flask-mail

Any possible workarounds? Any help will be greatly appreciated. Thanks!

回答1:

The easiest way to avoid these kind of problems is to create a virtual environment

>>>pip install virtualenv

>>>cd my_project_folder
>>>virtualenv venv

now activate your virtual environment

>>>source venv/bin/activate

now install there pip install Flask-Mail
hopefully now it should work there

if your done working then deactivate it

 >>>deactivate

or

It seems like all the problem is because of certifi version conflict

so try downloading the source from here https://pypi.python.org/pypi/certifi

and install from source

Extract it go into the folder and run this command

sudo python setup.py  install

and it should work

peace

来源：https://stackoverflow.com/questions/36234440/unable-to-install-flask-mail