constant-bit-rate-modulo.py

#!/usr/bin/env python3
"""Generate data at constant rate (float interval).

To try, run:

    $ python3 constant-bit-rate-modulo.py | pv >/dev/null

"""
from time import sleep, monotonic as timer

chunksize, interval = 1024, 0.03125 # 32KiB/s
chunk = 'x' * chunksize
while True:
    # assume print(chunk) takes less than interval seconds
    sleep(interval - timer() % interval) # use modulo to support float interval
    print(chunk)

constant-bit-rate.py

#!/usr/bin/env python3
"""Generate data at constant rate.

To try, run:

    $ python3 constant-bit-rate.py | pv >/dev/null

"""
from time import sleep, monotonic as timer

chunksize = 1 << 15 # 32K
interval = 1 # per second
chunk = 'x' * chunksize
deadline = timer()
while True:
    deadline += interval
    print(chunk)
    delay = deadline - timer()
    if delay > 0:
        sleep(delay)