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Multiprocessing

Метки: python

Example by Michele Simionato in comp lang python. Here is an example of using multiprocessing (which is included in Python 2.6 and easy_installable in older Python versions) to print a spin bar while a computation is running:

import sys, time
import multiprocessing
DELAY = 0.1
DISPLAY = [ '|', '/', '-', '\\' ]
def spinner_func(before='', after=''):
    write, flush = sys.stdout.write, sys.stdout.flush
    pos = -1
    while True:
        pos = (pos + 1) % len(DISPLAY)
        msg = before + DISPLAY[pos] + after
        write(msg); flush()
        write('\x08' * len(msg))
        time.sleep(DELAY)
def long_computation():
    # emulate a long computation
    time.sleep(3)
if __name__ == '__main__':
    spinner = multiprocessing.Process(
        None, spinner_func, args=('Please wait ... ', ''))
    spinner.start()
    try:
        long_computation()
        print 'Computation done'
    finally:
        spinner.terminate()