def OnClick(self,event):
print "a:", a
os.system('iperf -s -w a')
Here a is displayed correctly. But in the os.system command the value of a is taken as 0.
Could you please help me on this?
-
Try creating this command separately to avoid such errors. Something like <command = 'iperf -s -w {}'.format(a) > or if 'a' is always string then you can also use %s. <command = 'iperf -s -w %s'%a >mrutyunjay– mrutyunjay2013-12-24 06:24:26 +00:00Commented Dec 24, 2013 at 6:24
Add a comment
|
2 Answers
You are not passing the value of a, but you are passing a as it is. So, you might want to do this
os.system('iperf -s -w {}'.format(a))
Now, the value of a will be substituted at {}. You can see the difference between both the versions by printing them
print 'iperf -s -w {}'.format(a)
print 'iperf -s -w a'
9 Comments
user3131595
thank u..got it..Could you please tell me any other ways to call an external command and the output of the command has to be displayed also..
thefourtheye
@user3131595 You might want to look at
subprocess.check_outputuser3131595
>>> subprocess.check_output(["echo", "Hello World!"]) Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'subprocess' is not defined >>>
thefourtheye
Did you
import subprocess?thefourtheye
@user3131595 Can you please add the updated code to the question?
|
os.system('iperf -s -w a')
takes literal a and not the value of the variable. I would use:
cmd = 'iperf -s -w %d' %a
os.system (cmd)
