Why doesn't the following program write to the file?
driver.py
-------
import subprocess as sub
p = sub.Popen(["python", "-u", "test1.py"], stdin=sub.PIPE,
stdout=sub.PIPE)
p.stdin.write("text3")
while True:
pass
-------
test1.py:
---------
import sys
data = sys.stdin.read()
f = open("aaa.txt", "w")
f.write(data + "\n")
f.close()
-----------
After I hit Ctrl+C to end the program and look in the file, the text
wasn't written to the file. But, if I change driver.py to the
following it works:
driver.py:
----------
import subprocess as sub
p = sub.Popen(["python", "-u", "test1.py"], stdin=sub.PIPE,
stdout=sub.PIPE)
p.stdin.write("text3")
-------
Ok. So that looks like the data is caught in a buffer--even though the
pipes should be unbuffered by default. But this doesn't work:
driver.py
----------
import subprocess as sub
p = sub.Popen(["python", "-u", "test1.py"], stdin=sub.PIPE,
stdout=sub.PIPE)
p.stdin.write("text4")
p.stdin.flush()
while True:
pass
-------
It just hangs, and then when I hit Ctrl+C and look in the file, the
data isn't in there.
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