RxPY – utility操作符

delay

该操作符将按照给定的时间或日期延迟源观测排放。

语法

delay(timespan)

参数

timespan：这将是以秒为单位的时间或日期。

返回值

它将返回一个带有超时后发出的源值的可观察变量。

例子

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")

输出

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

这个操作符将把来自源观测器的值与以显式通知值的形式发出的值进行转换。

语法

materialize()

返回值

这将返回一个可观察到的、以显式通知值形式发射的值。

例子

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)))

输出

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

该操作符将给出来自源观测点的值之间的时间间隔。

语法

time_interval()

返回值

它将返回一个观测值，该观测值将包含源值发射之间所经过的时间。

例子

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)))

输出

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

这个操作符将在过了时间后给出源观测点的所有值，否则将触发一个错误。

语法

timeout(duetime)

参数

duetime：以秒为单位的时间。

返回值

它将返回带有源观测点的所有值的可观测点。

例子

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)))

输出

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

这个操作符将为源观察变量的所有值附加一个时间戳。

语法

timestamp()

返回值

它将返回一个包含源观测点的所有值以及一个时间戳的可观测值。

例子

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)))

输出

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))