def _window_to_group(self, value):
return value.pipe(
ops.to_iterable(),
ops.map(
lambda x: rx.from_iterable(x).pipe(ops.group_by(
_group_by), ops.map(_group_to_batch), ops.merge_all())),
ops.merge_all())
def on_mouse_up(self) -> Observable[MouseButtonEvent]:
return self.on_state_change.pipe(
ops.map(lambda s: s.buttons),
ops.distinct_until_changed(),
ops.pairwise(),
ops.flat_map(lambda b: b[0] - b[1]),
ops.map(lambda b: MouseUpEvent(self, self.state.unwrap(), b)))
def action1(scheduler, state):
xs[0] = reactivex.from_iterable(
["alpha", "apple", "beta", "bat", "gamma"]
).pipe(
ops.group_by(lambda s: s[0]),
ops.map(lambda xs: xs.pipe(ops.to_iterable(), ops.map(list))),
ops.merge_all(),
)
def main():
app = QApplication(sys.argv)
scheduler = QtScheduler(QtCore)
window = Window()
window.show()
text = "TIME FLIES LIKE AN ARROW"
def on_next(info):
label, (x, y), i = info
label.move(x + i * 12 + 15, y)
label.show()
def handle_label(label, i):
delayer = ops.delay(i * 0.100)
mapper = ops.map(lambda xy: (label, xy, i))
return window.mousemove.pipe(
delayer,
mapper,
)
labeler = ops.flat_map_indexed(handle_label)
mapper = ops.map(lambda c: QLabel(c, window))
reactivex.from_(text).pipe(
mapper,
labeler,
).subscribe(on_next, on_error=print, scheduler=scheduler)
sys.exit(app.exec_())
def mapper(ys, i):
def proj(y):
return "%s %s" % (i, y)
return ys.pipe(
ops.map(proj),
ops.concat(reactivex.return_value("%s end" % i)))
def main() -> None:
root = Tk()
root.title("Rx for Python rocks")
scheduler = TkinterScheduler(root)
mousemoves: Subject[Event[Any]] = Subject()
frame = Frame(root, width=600, height=600)
frame.bind("<Motion>", mousemoves.on_next)
text = "TIME FLIES LIKE AN ARROW"
def on_next(info: Tuple[tkinter.Label, "Event[Frame]", int]) -> None:
label, ev, i = info
label.place(x=ev.x + i * 12 + 15, y=ev.y)
def label2stream(
label: tkinter.Label, index: int
) -> Observable[Tuple[tkinter.Label, "Event[Frame]", int]]:
return mousemoves.pipe(
ops.map(lambda ev: (label, ev, index)),
ops.delay(index * 0.1),
)
def char2label(char: str) -> Label:
return Label(frame, text=char, borderwidth=0, padx=0, pady=0)
reactivex.from_(text).pipe(
ops.map(char2label),
ops.flat_map_indexed(label2stream),
).subscribe(on_next, on_error=print, scheduler=scheduler)
frame.pack()
root.mainloop()
def main():
xs = reactivex.from_marbles("1-2-3-4-5-6-7-9-|").pipe(ops.publish())
xs.pipe(ops.map(failing), ops.retry()).subscribe(print)
xs.connect() # Must connect. Cannot use ref_count() with publish()
time.sleep(5)
def open(self):
scheduler = AsyncIOScheduler(asyncio.get_event_loop())
print("WebSocket opened")
# A Subject is both an observable and observer, so we can both subscribe
# to it and also feed (send) it with new values
self.subject: Subject[Dict[str, str]] = Subject()
# Get all distinct key up events from the input and only fire if long enough and distinct
searcher = self.subject.pipe(
ops.map(lambda x: x["term"]),
ops.filter(lambda text: len(text) > 2
), # Only if the text is longer than 2 characters
ops.debounce(0.750), # Pause for 750ms
ops.distinct_until_changed(), # Only if the value has changed
ops.flat_map_latest(search_wikipedia),
)
def send_response(x: HTTPResponse) -> None:
self.write_message(x.body)
def on_error(ex: Exception):
print(ex)
searcher.subscribe(on_next=send_response,
on_error=on_error,
scheduler=scheduler)
def main():
parse_row.progress = 0
url = "https://github.com/influxdata/influxdb-client-python/wiki/data/stock-prices-example.csv"
response = requests.get(url, stream=True)
data = rx \
.from_iterable(DictReader(response.iter_lines(decode_unicode=True))) \
.pipe(ops.map(lambda row: parse_row(row)))
client = InfluxDBClient(url="http://localhost:8086",
token="my-token",
org="my-org",
debug=False)
write_api = client.write_api(
write_options=WriteOptions(batch_size=50_000, flush_interval=10_000))
write_api.write(bucket="my-bucket", record=data)
write_api.close()
query = '''
from(bucket:"my-bucket")
|> range(start: 0, stop: now())
|> filter(fn: (r) => r._measurement == "financial-analysis")
|> filter(fn: (r) => r.symbol == "AAPL")
|> filter(fn: (r) => r._field == "close")
|> drop(columns: ["_start", "_stop", "table", "_field","_measurement"])
'''
result = client.query_api().query_data_frame(query=query)
print(result.head(100))
"""
Close client
"""
client.close()
def test_map_disposeinsidemapper(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(100, 1), on_next(200, 2), on_next(500, 3), on_next(600, 4)
)
results = scheduler.create_observer()
d = SerialDisposable()
invoked = [0]
def projection(x, *args, **kw):
invoked[0] += 1
if scheduler.clock > 400:
d.dispose()
return x
d.disposable = xs.pipe(map(projection)).subscribe(results, scheduler)
def action(scheduler, state):
return d.dispose()
scheduler.schedule_absolute(ReactiveTest.disposed, action)
scheduler.start()
assert results.messages == [on_next(100, 1), on_next(200, 2)]
assert xs.subscriptions == [ReactiveTest.subscribe(0, 500)]
assert invoked[0] == 3
def create():
def mapper(x):
return TimeInterval(x.value, x.interval)
return xs.pipe(
ops.time_interval(),
ops.map(mapper),
)
def _retryable(self, data: str, delay: datetime.timedelta):
return rx.of(data).pipe(
ops.delay(duetime=delay, scheduler=self._scheduler),
ops.map(lambda x: self._http(x)),
ops.catch(handler=lambda exception, source: self._retry_handler(
exception, source, data)),
)
def handle_label(label, i):
delayer = ops.delay(i * 0.100)
mapper = ops.map(lambda xy: (label, xy, i))
return window.mousemove.pipe(
delayer,
mapper,
)
def factory(scheduler_: Optional[abc.SchedulerBase] = None):
_scheduler = scheduler or scheduler_ or TimeoutScheduler.singleton(
)
def mapper(value: _T) -> Timestamp[_T]:
return Timestamp(value=value, timestamp=_scheduler.now)
return source.pipe(operators.map(mapper))
def create():
def mapper(x):
return Timestamp(x.value, x.timestamp)
return xs.pipe(
ops.timestamp(),
ops.map(mapper),
)
def label2stream(
label: tkinter.Label, index: int
) -> Observable[Tuple[tkinter.Label, "Event[Frame]", int]]:
return mousemoves.pipe(
ops.map(lambda ev: (label, ev, index)),
ops.delay(index * 0.1),
)
def factory():
def key_mapper(x):
key_invoked[0] += 1
return x.lower().strip()
return xs.pipe(
ops.group_by(key_mapper, lambda x: x),
ops.map(lambda g: g.key),
)
def factory():
def projection(x):
invoked[0] += 1
if invoked[0] == 3:
raise Exception(ex)
return x + 1
return xs.pipe(map(projection))
def test_map_throws(self):
mapper = map(lambda x: x)
with self.assertRaises(RxException):
return_value(1).pipe(mapper).subscribe(lambda x: _raise("ex"))
with self.assertRaises(RxException):
throw("ex").pipe(mapper).subscribe(on_error=lambda ex: _raise(ex))
with self.assertRaises(RxException):
empty().pipe(mapper).subscribe(
lambda x: x, lambda ex: ex, lambda: _raise("ex")
)
def subscribe(observer, scheduler=None):
_raise("ex")
with self.assertRaises(RxException):
create(subscribe).pipe(map(lambda x: x)).subscribe()
def sum_(
key_mapper: Optional[Mapper[Any, float]] = None
) -> Callable[[Observable[Any]], Observable[float]]:
if key_mapper:
return compose(ops.map(key_mapper), ops.sum())
def accumulator(prev: float, cur: float) -> float:
return prev + cur
return ops.reduce(seed=0, accumulator=accumulator)
def __init__(self) -> None:
self._subject = Subject()
self._scheduler = ThreadPoolScheduler(max_workers=1)
obs = self._subject.pipe(ops.observe_on(self._scheduler))
self._disposable = obs \
.pipe(ops.window_with_time_or_count(count=5, timespan=datetime.timedelta(milliseconds=10_000)),
ops.flat_map(lambda x: self._window_to_group(x)),
ops.map(mapper=lambda x: self._retryable(data=x, delay=self._jitter_delay(jitter_interval=1000))),
ops.merge_all()) \
.subscribe(self._result, self._error, self._on_complete)
pass
def test_groupby_count(self):
res = []
counts = reactivex.from_(range(10)).pipe(
ops.group_by(lambda i: "even" if i % 2 == 0 else "odd"),
ops.flat_map(lambda i: i.pipe(
ops.count(),
ops.map(lambda ii: (i.key, ii)),
)),
)
counts.subscribe(on_next=res.append)
assert res == [("even", 5), ("odd", 5)]
def factory():
def key_mapper(x):
key_invoked[0] += 1
return x.lower().strip()
def element_mapper(x):
ele_invoked[0] += 1
return x[::-1] # Yes, this is reverse string in Python
return xs.pipe(
ops.group_by(key_mapper, element_mapper),
ops.map(lambda g: g.key),
)
def window_toggle(source: Observable[_T]) -> Observable[Observable[_T]]:
def mapper(args: Tuple[Any, Observable[_T]]):
_, window = args
return window
return openings.pipe(
ops.group_join(
source,
closing_mapper,
lambda _: empty(),
),
ops.map(mapper),
)
def factory():
def key_mapper(x):
key_invoked[0] += 1
return x.lower().strip()
def element_mapper(x):
ele_invoked[0] += 1
return x[::-1]
return xs.pipe(
ops.group_by(key_mapper, element_mapper),
ops.map(lambda g: g.key),
)
def average(source: Observable[Any]) -> Observable[float]:
"""Partially applied average operator.
Computes the average of an observable sequence of values that
are in the sequence or obtained by invoking a transform
function on each element of the input sequence if present.
Examples:
>>> res = average(source)
Args:
source: Source observable to average.
Returns:
An observable sequence containing a single element with the
average of the sequence of values.
"""
key_mapper_: typing.Mapper[_T, float] = key_mapper or (
lambda x: float(cast(Any, x)))
def accumulator(prev: AverageValue, cur: float) -> AverageValue:
return AverageValue(sum=prev.sum + cur, count=prev.count + 1)
def mapper(s: AverageValue) -> float:
if s.count == 0:
raise Exception("The input sequence was empty")
return s.sum / float(s.count)
seed = AverageValue(sum=0, count=0)
ret = source.pipe(
operators.map(key_mapper_),
operators.scan(accumulator, seed),
operators.last(),
operators.map(mapper),
)
return ret
def create():
def mapper(xy):
x, y = xy
return "{}{}".format(x.value, y.value)
return xs.pipe(
ops.join(
ys,
lambda x: reactivex.timer(x.interval),
lambda y: reactivex.timer(y.interval),
),
ops.map(mapper),
)
def all_(
predicate: Predicate[_T]
) -> Callable[[Observable[_T]], Observable[bool]]:
def filter(v: _T):
return not predicate(v)
def mapping(b: bool) -> bool:
return not b
return compose(
ops.filter(filter),
ops.some(),
ops.map(mapping),
)
def pluck_attr_(prop: str) -> Callable[[Observable[Any]], Observable[Any]]:
"""Retrieves the value of a specified property (using getattr) from
all elements in the Observable sequence.
Args:
property: The property to pluck.
Returns a new Observable {Observable} sequence of property values.
To pluck values using dict-like access (as in element[key]) on each
element, use pluck.
"""
return ops.map(lambda x: getattr(x, prop))
def is_empty_() -> Callable[[Observable[Any]], Observable[bool]]:
"""Determines whether an observable sequence is empty.
Returns:
An observable sequence containing a single element
determining whether the source sequence is empty.
"""
def mapper(b: bool) -> bool:
return not b
return compose(
ops.some(),
ops.map(mapper),
)
