On Feb 16, 10:20 pm, [email protected] wrote:
> Hi again
>
> OpenERP and ERP5 was written in python as i know. I really wonder how
> they do this without threads. I want to see a real time graph at the
> same time while i am working on the same screen. What is the secret?
>
> Thanks
> Rushen
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()
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