virtualEnvironment/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py
def is_invalid_marker(cls, text):
        """
        Validate text as a PEP 426 environment marker; return an exception
        if invalid or False otherwise.
        """
        try:
            cls.evaluate_marker(text)
        except SyntaxError:
            return cls.normalize_exception(sys.exc_info()[1])
        return False
def is_invalid_marker(cls, text):
        """
        Validate text as a PEP 426 environment marker; return an exception
        if invalid or False otherwise.
        """
        try:
            cls.evaluate_marker(text)
        except SyntaxError:
            return cls.normalize_exception(sys.exc_info()[1])
        return False
Validate text as a PEP 426 environment marker; return an exception
        if invalid or False otherwise.