3 examples of 'pycharm virtualenv' in Python

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def create_virtualenv(self, no_site_packages=True):
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    """Creates the virtual environment and installs PIP.
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    Creates the virtual environment and installs PIP only into the
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    virtual environment.
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    """
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    if not os.path.isdir(self.venv):
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        print 'Creating venv...',
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        if no_site_packages:
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            self.run_command(['virtualenv', '-q', '--no-site-packages',
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                             self.venv])
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        else:
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            self.run_command(['virtualenv', '-q', self.venv])
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        print 'done.'
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        print 'Installing pip in venv...',
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        if not self.run_command(['tools/with_venv.sh', 'easy_install',
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                                'pip>1.0']).strip():
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            self.die("Failed to install pip.")
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        print 'done.'
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    else:
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        print "venv already exists..."
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        pass

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def activate_virtualenv(venv):
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    """Activate a virtualenv in the current Python process."""
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    with open(venv['activate_this']) as f:
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        exec(f.read(), dict(__file__=venv['activate_this']))

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@patch.object(os, 'getenv', return_value='')
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def test_get_virtualenv_without_virtualenv(self, os_mock):
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    """
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    Calling get_virtualenv without being in a virtualenv
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    should raise an exception
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    """
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    with self.assertRaises(core.VirtualenvError):
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        core.get_virtualenv()