Stuck in while True loop python

Question

I am stuck in a while True loop which I can't seem to break, any suggestions please:

command1 = transporterLink + " -m verify -f " + indir1 + " -u " + username + " -p " + password + " -o " + indir1 + "/VerifyLog.txt -s " + provider1 + " -v eXtreme"
master, slave = pty.openpty()

process = Popen(command1, shell=True, stdin=PIPE, stdout=slave, stderr=slave, close_fds=True)
stdout = os.fdopen(master)
while True:
    wx.Yield()
    line = stdout.readline()
    print line.rstrip()
    if not line:
        break
process.wait()

Do you ever get an empty line from stdout?

NPE
– NPE

2014-02-09 20:57:32 +00:00
Commented Feb 9, 2014 at 20:57 — NPE
– NPE, Commented Feb 9, 2014 at 20:57

NPE · Accepted Answer · 2014-02-09 20:59:02Z

4

The simplest explanation is that you never get an empty line from stdout. Note that print line.rstrip() does not modify line; for example, if the last line ended with a newline, the loop would continue.

answered Feb 9, 2014 at 20:59

NPE

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2 Comments

speedyrazor Over a year ago

Thanks NPE, any suggestions on how I could get out of this loop when at the end?

SethMMorton Over a year ago

@speedyrazor You might consider if not line.strip(): instead.

speedyrazor · Accepted Answer · 2014-02-10 06:05:31Z

0

Sorted. I know that at the end of the last line it will return one of two strings so just needed to search for either of these two:

process = Popen(command1, shell=True, stdin=PIPE, stdout=slave, stderr=slave, close_fds=True)
stdout = os.fdopen(master)
while True:
    wx.Yield()
    line = stdout.readline()
    line = line.rstrip()
    print line
    if "Returning 1" in line:
        break
    if "Returning 0" in line:
        break

answered Feb 10, 2014 at 6:05

speedyrazor

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