Pure python implementation of Qt Signals

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  • License: BSD License (BSD-3-Clause)
  • Author: Talley Lambert
  • Requires: Python >=3.7
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psygnal

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Pure python implementation of Qt-style Signals, with (optional) signature and type checking, and support for threading.

Usage

Install

pip install psygnal

Basic usage

If you are familiar with the Qt Signals & Slots API as implemented in PySide and PyQt5, then you should be good to go! psygnal aims to be a superset of those APIs (some functions do accept additional arguments, like check_nargs and check_types).

Note: the name "Signal" is used here instead of pyqtSignal, following the qtpy and PySide convention.

from psygnal import Signal

# create an object with class attribute Signals
class MyObj:

    # this signal will emit a single string
    value_changed = Signal(str)

    def __init__(self, value=0):
        self._value = value

    def set_value(self, value):
        if value != self._value:
            self._value = str(value)
            # emit the signal
            self.value_changed.emit(self._value)

def on_value_changed(new_value):
    print(f"The new value is {new_value!r}")

# instantiate the object with Signals
obj = MyObj()

# connect one or more callbacks with `connect`
obj.value_changed.connect(on_value_changed)

# callbacks are called when value changes
obj.set_value('hello!')  # prints: 'The new value is 'hello!'

# disconnect callbacks with `disconnect`
obj.value_changed.disconnect(on_value_changed)

connect as a decorator

.connect() returns the object that it is passed, and so can be used as a decorator.

@obj.value_changed.connect
def some_other_callback(value):
    print(f"I also received: {value!r}")

obj.set_value('world!')
# prints:
# I also received: 'world!'

Connection safety (number of arguments)

psygnal prevents you from connecting a callback function that is guaranteed to fail due to an incompatible number of positional arguments. For example, the following callback has too many arguments for our Signal (which we declared above as emitting a single argument: Signal(str))

def i_require_two_arguments(first, second):
    print(first, second)

obj.value_changed.connect(i_require_two_arguments)

raises:

ValueError: Cannot connect slot 'i_require_two_arguments' with signature: (first, second):
- Slot requires at least 2 positional arguments, but spec only provides 1

Accepted signature: (p0: str, /)

Note: Positional argument checking can be disabled with connect(..., check_nargs=False)

Extra positional arguments ignored

While a callback may not require more positional arguments than the signature of the Signal to which it is connecting, it may accept less. Extra arguments will be discarded when emitting the signal (so it isn't necessary to create a lambda to swallow unnecessary arguments):

obj = MyObj()

def no_args_please():
    print(locals())

obj.value_changed.connect(no_args_please)

# otherwise one might need
# obj.value_changed.connect(lambda a: no_args_please())

obj.value_changed.emit('hi')  # prints: "{}"

Connection safety (types)

For type safety when connecting slots, use check_types=True when connecting a callback. Recall that our signal was declared as accepting a string Signal(str). The following function has an incompatible type annotation: x: int.

# this would fail because you cannot concatenate a string and int
def i_expect_an_integer(x: int):
    print(f'{x} + 4 = {x + 4}')

# psygnal won't let you connect it
obj.value_changed.connect(i_expect_an_integer, check_types=True)

raises:

ValueError: Cannot connect slot 'i_expect_an_integer' with signature: (x: int):
- Slot types (x: int) do not match types in signal.

Accepted signature: (p0: str, /)

Note: unlike Qt, psygnal does not perform any type coercion when emitting a value.

Connection safety (object references)

psygnal tries very hard not to hold strong references to connected objects. In the simplest case, if you connect a bound method as a callback to a signal instance:

class T:
    def my_method(self):
        ...

obj = T()
signal.connect(t.my_method)

Then there is a risk of signal holding a reference to obj even after obj has been deleted, preventing garbage collection (and possibly causing errors when the signal is emitted next). Psygnal avoids this with weak references. It goes a bit farther, trying to prevent strong references in these cases as well:

  • class methods used as the callable in functools.partial
  • decorated class methods that mangle the name of the callback.

Another common case for leaking strong references is a partial closing on an object, in order to set an attribute:

class T:
    x = 1

obj = T()
signal.connect(partial(setattr, obj, 'x'))  # ref to obj stuck in the connection

Here, psygnal offers the connect_settatr convenience method, which reduces code and helps you avoid leaking strong references to obj:

signal.connect_setatttr(obj, 'x')

Query the sender

Similar to Qt's QObject.sender() method, a callback can query the sender using the Signal.sender() class method. (The implementation is of course different than Qt, since the receiver is not a QObject.)

obj = MyObj()

def curious():
    print("Sent by", Signal.sender())
    assert Signal.sender() == obj

obj.value_changed.connect(curious)
obj.value_changed.emit(10)

# prints (and does not raise):
# Sent by <__main__.MyObj object at 0x1046a30d0>

If you want the actual signal instance that is emitting the signal (obj.value_changed in the above example), use Signal.current_emitter().

Emitting signals asynchronously (threading)

There is experimental support for calling all connected slots in another thread, using emit(..., asynchronous=True)

obj = MyObj()

def slow_callback(arg):
    import time
    time.sleep(0.5)
    print(f"Hi {arg!r}, from another thread")

obj.value_changed.connect(slow_callback)

This one is called synchronously (note the order of print statements):

obj.value_changed.emit('friend')
print("Hi, from main thread.")

# after 0.5 seconds, prints:
# Hi 'friend', from another thread
# Hi, from main thread.

This one is called asynchronously, and immediately returns to the caller. A threading.Thread object is returned.

thread = obj.value_changed.emit('friend', asynchronous=True)
print("Hi, from main thread.")

# immediately prints
# Hi, from main thread.

# then after 0.5 seconds this will print:
# Hi 'friend', from another thread

Note: The user is responsible for joining and managing the threading.Thread instance returned when calling .emit(..., asynchronous=True).

Experimental! While thread-safety is the goal, (RLocks are used during important state mutations) it is not guaranteed. Please use at your own risk. Issues/PRs welcome.

Blocking a signal

To temporarily block a signal, use the signal.blocked() context context manager:

obj = MyObj()

with obj.value_changed.blocked():
    # do stuff without obj.value_changed getting emitted
    ...

To block/unblock permanently (outside of a context manager), use signal.block() and signal.unblock().

Pausing a signal

Sometimes it is useful to temporarily collect/buffer emission events, and then emit them together as a single event. This can be accomplished using the signal.pause()/signal.resume() methods, or the signal.paused() context manager.

If a function is passed to signal.paused(func) (or signal.resume(func)) it will be passed to functools.reduce to combine all of the emitted values collected during the paused period, and a single combined value will be emitted.

obj = MyObj()
obj.value_changed.connect(print)

# note that signal.paused() and signal.resume() accept a reducer function
with obj.value_changed.paused(lambda a,b: (f'{a[0]}_{b[0]}',), ('',)):
    obj.value_changed('a')
    obj.value_changed('b')
    obj.value_changed('c')
# prints '_a_b_c'

NOTE: args passed to emit are collected as tuples, so the two arguments passed to reducer will always be tuples. reducer must handle that and return an args tuple. For example, the three emit() events above would be collected as

[('a',), ('b',), ('c',)]

and would be reduced and re-emitted as follows:

obj.emit(*functools.reduce(reducer, [('a',), ('b',), ('c',)]))

Other similar libraries

There are other libraries that implement similar event-based signals, they may server your purposes better depending on what you are doing.

PySignal (deprecated)

This package borrows inspiration from – and is most similar to – the now deprecated PySignal project, with a few notable new features in psygnal regarding signature and type checking, sender querying, and threading.

similarities with PySignal

  • still a "Qt-style" signal implementation that doesn't depend on Qt
  • supports class methods, functions, lambdas and partials

differences with PySignal

  • the class attribute pysignal.ClassSignal is called simply Signal in psygnal (to more closely match the PyQt/Pyside syntax). Correspondingly pysignal.Signal is similar to psygnal.SignalInstance.
  • Whereas PySignal refrained from doing any signature and/or type checking either at slot-connection time, or at signal emission time, psygnal offers signature declaration similar to Qt with , for example, Signal(int, int). along with opt-in signature compatibility (with check_nargs=True) and type checking (with check_types=True). .connect(..., check_nargs=True) in particular ensures that any slot to connected to a signal will at least be compatible with the emitted arguments.
  • You can query the sender in psygnal by using the Signal.sender() or Signal.current_emitter() class methods. (The former returns the instance emitting the signal, similar to Qt's QObject.sender() method, whereas the latter returns the currently emitting SignalInstance.)
  • There is basic threading support (calling all slots in another thread), using emit(..., asynchronous=True). This is experimental, and while thread-safety is the goal, it is not guaranteed.
  • There are no SignalFactory classes here.

The following two libraries implement django-inspired signals, they do not attempt to mimic the Qt API.

Blinker

Blinker provides a fast dispatching system that allows any number of interested parties to subscribe to events, or "signals".

SmokeSignal

(This appears to be unmaintained)

Benchmark history

https://www.talleylambert.com/psygnal/

Developers

Debugging

While psygnal is a pure python module, it is compiled with Cython to increase performance. To import psygnal in uncompiled mode, without deleting the shared library files from the psyngal module, set the environment variable PSYGNAL_UNCOMPILED before importing psygnal. The psygnal._compiled variable will tell you if you're running the compiled library or not.

Project details

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  • License: BSD License (BSD-3-Clause)
  • Author: Talley Lambert
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