(self, variable_name, silent=False)
return self.from_pyfile(rv, silent=silent)
Loads a configuration from an environment variable pointing to
        a configuration file.  This is basically just a shortcut with nicer
        error messages for this line of code::

            app.config.from_pyfile(os.environ['YOURAPPLICATION_SETTINGS'])

        :param variable_name: name of the environment variable
        :param silent: set to ``True`` if you want silent failure for missing
                       files.
        :return: bool. ``True`` if able to load config, ``False`` otherwise.
Loads a configuration from an environment variable pointing to
        a configuration file.  This is basically just a shortcut with nicer
        error messages for this line of code::
Loads a configuration from an environment variable pointing to a configuration file . This is basically just a shortcut with nicer error messages for this line of code ::
def from_envvar(self, variable_name, silent=False):
        """Loads a configuration from an environment variable pointing to
        a configuration file.  This is basically just a shortcut with nicer
        error messages for this line of code::

            app.config.from_pyfile(os.environ['YOURAPPLICATION_SETTINGS'])

        :param variable_name: name of the environment variable
        :param silent: set to ``True`` if you want silent failure for missing
                       files.
        :return: bool. ``True`` if able to load config, ``False`` otherwise.
        """
        rv = os.environ.get(variable_name)
        if not rv:
            if silent:
                return False
            raise RuntimeError('The environment variable %r is not set '
                               'and as such configuration could not be '
                               'loaded.  Set this variable and make it '
                               'point to a configuration file' %
                               variable_name)
        return self.from_pyfile(rv, silent=silent)
def from_envvar ( self , variable_name , silent = False ) : rv = os . environ . get ( variable_name ) if not rv : if silent : return False raise RuntimeError ( 'The environment variable %r is not set ' 'and as such configuration could not be ' 'loaded.  Set this variable and make it ' 'point to a configuration file' % variable_name ) return self . from_pyfile ( rv , silent = silent )