May 23, 2019 · May 19, 2019
diff --git a/CHANGES.rst b/CHANGES.rst
 -   The return value from :meth:`cli.load_dotenv` is more consistent
    with the documentation. It will return ``False`` if python-dotenv is
    not installed, or if the given path isn't a file. :issue:`2937`
 -   Signaling support has a stub for the ``connect_via`` method when
    the Blinker library is not installed. :pr:`3208`

 .. _#2935: https://github.com/pallets/flask/issues/2935
 .. _#2957: https://github.com/pallets/flask/issues/2957
diff --git a/flask/signals.py b/flask/signals.py
            self.name = name
            self.__doc__ = doc

        def send(self, *args, **kwargs):
            pass

        def _fail(self, *args, **kwargs):
            raise RuntimeError(
                "signalling support is unavailable "
                "because the blinker library is "
                "not installed."
                "Signalling support is unavailable because the blinker"
                " library is not installed."
            )

        send = lambda *a, **kw: None
        connect = (
            disconnect
        ) = (
            has_receivers_for
        ) = receivers_for = temporarily_connected_to = connected_to = _fail
        connect = connect_via = connected_to = temporarily_connected_to = _fail
        disconnect = _fail
        has_receivers_for = receivers_for = _fail
        del _fail
Original file line number	Diff line number	Diff line change
Expand Up		@@ -47,6 +47,8 @@ Unreleased
		- The return value from :meth:`cli.load_dotenv` is more consistent
		with the documentation. It will return ``False`` if python-dotenv is
		not installed, or if the given path isn't a file. :issue:`2937`
		- Signaling support has a stub for the ``connect_via`` method when
		the Blinker library is not installed. :pr:`3208`

		.. _#2935: https://github.com/pallets/flask/issues/2935
		.. _#2957: https://github.com/pallets/flask/issues/2957
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Original file line number	Diff line number	Diff line change
Expand Up		@@ -32,19 +32,18 @@ def __init__(self, name, doc=None):
		self.name = name
		self.__doc__ = doc

		def send(self, args, *kwargs):
		pass

		def _fail(self, args, *kwargs):
		raise RuntimeError(
		"signalling support is unavailable "
		"because the blinker library is "
		"not installed."
		"Signalling support is unavailable because the blinker"
		" library is not installed."
		)

		send = lambda a, *kw: None
		connect = (
		disconnect
		) = (
		has_receivers_for
		) = receivers_for = temporarily_connected_to = connected_to = _fail
		connect = connect_via = connected_to = temporarily_connected_to = _fail
		disconnect = _fail
		has_receivers_for = receivers_for = _fail
		del _fail


Expand Down