RxPY - Utility Operators

delay

This operator will delay the source observable emission as per the time or date given.

Syntax

delay(timespan)

Parameters

timespan: this will be the time in seconds or date.

Return value

It will give back an observable with source values emitted after the timeout.

Example

from rx import of, operators as op
import datetime
test1 = of(1,2,3,4,5)
sub1 = test1.pipe(
   op.delay(5.0)
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))
input("Press any key to exit\n")

Output

E:\pyrx>python testrx.py
Press any key to exit
The value is 1
The value is 2
The value is 3
The value is 4
The value is 5

materialize

This operator will convert the values from the source observable with the values emitted in the form of explicit notification values.

Syntax

materialize()

Return value

This will give back an observable with the values emitted in the form of explicit notification values.

Example

from rx import of, operators as op
import datetime
test1 = of(1,2,3,4,5)
sub1 = test1.pipe(
   op.materialize()
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))

Output

E:\pyrx>python testrx.py
The value is OnNext(1.0)
The value is OnNext(2.0)
The value is OnNext(3.0)
The value is OnNext(4.0)
The value is OnNext(5.0)
The value is OnCompleted()

time_interval

This operator will give the time elapsed between the values from the source observable.

Syntax

time_interval()

Return value

It will return an observable that will have the time elapsed, between the source value emitted.

Example

from rx import of, operators as op
from datetime import date
test = of(1,2,3,4,5,6)
sub1 = test.pipe(
   op.time_interval()
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))

Output

E:\pyrx>python testrx.py
The value is TimeInterval(value=1, interval=datetime.timedelta(microseconds=1000
))
The value is TimeInterval(value=2, interval=datetime.timedelta(0))
The value is TimeInterval(value=3, interval=datetime.timedelta(0))
The value is TimeInterval(value=4, interval=datetime.timedelta(microseconds=1000
))
The value is TimeInterval(value=5, interval=datetime.timedelta(0))
The value is TimeInterval(value=6, interval=datetime.timedelta(0))

timeout

This operator will give all the values from the source observable, after the elapsed time or else will trigger an error.

Syntax

timeout(duetime)

Parameters

duetime: the time given in seconds.

Return value

It will give back on observable with all values from the source observable.

Example

from rx import of, operators as op
from datetime import date
test = of(1,2,3,4,5,6)
sub1 = test.pipe(
   op.timeout(5.0)
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))

Output

E:\pyrx>python testrx.py
The value is 1
The value is 2
The value is 3
The value is 4
The value is 5
The value is 6

timestamp

This operator will attach a timestamp to all the values from the source observable.

Syntax

timestamp()

Return value

It will give back an observable with all values from the source observable along with a timestamp.

Example

from rx import of, operators as op
from datetime import date
test = of(1,2,3,4,5,6)
sub1 = test.pipe(
   op.timestamp()
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))

Output

E:\pyrx>python testrx.py
The value is Timestamp(value=1, timestamp=datetime.datetime(2019, 11, 4, 4, 57,
44, 667243))
The value is Timestamp(value=2, timestamp=datetime.datetime(2019, 11, 4, 4, 57,
44, 668243))
The value is Timestamp(value=3, timestamp=datetime.datetime(2019, 11, 4, 4, 57,
44, 668243))
The value is Timestamp(value=4, timestamp=datetime.datetime(2019, 11, 4, 4, 57,
44, 668243))
The value is Timestamp(value=5, timestamp=datetime.datetime(2019, 11, 4, 4, 57,
44, 669243))
The value is Timestamp(value=6, timestamp=datetime.datetime(2019, 11, 4, 4, 57,
44, 669243))
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