parameters: (self, variable_name, silent=False)
return_statement: return self.from_pyfile(rv, silent=silent)
docstring: 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.
docstring_summary: 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::
docstring_tokens: 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 ::
function: 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)
function_tokens: 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 )