I notice a difference between running the following script on my Mac and on
a PC:
from time import sleep
for i in range(10):
print i,
sleep(2)
On my PC this prints a number every 2 seconds. This is the behavior I want.
On my Mac Python waits 10*2 = 20 seconds, and then prints 0 1 2 3 4 5 6 7 8
9
This sounds like a buffered vs. non-buffered output issue. My
guess would be that if you increased 10 to something larger, the
output buffer would flush at various intervals. The solution on
the Mac (or other *nix-like OSes) would be to either start python
in unbuffered mode:
python -u mycode.py
Alternatively, you can force a flush of the output buffer at each
iteration:
import sys
for i in range(10):
print i
sys.stdout.flush()
sleep(2)
Lastly, you can force all standard-output in your program to be
unbuffered without the "-u" parameter:
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
Hope this helps,
-tkc
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