timeout value in subprocess

[jonesin1974]

Hi,

The timeout works a treat if I hard code a value as such:

try: subprocess.run(['notepad.exe'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=2222) except: print("likely timeout.... Error: ", sys.exc_info()[0])

I'm writing a script for CI/CD testing and depending on my application, I may want it to time out after 5 seconds, or possibly even 15 minutes.  This will all get controlled by my own config file.

I'd like to do something along the lines of:

strTimeoutDuration = "5" #5 seconds.  This obtained previously in my script but hard coding for this example.
strTimeout = "timeout=" + strTimeoutDuration
subprocess.run(['notepad.exe'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, strTimeout)

Is this feasible?  Last thing I want is to wait an upper limit of say 15 minutes for all applications when I know it was hanging after 10 seconds of not finishing.

Many thanks,
​​​​​​​J

[jonesin1974]

Right, got there in the end.  Still very new to Python so getting my head around syntax and understanding the help files.

In case anyone was wondering,
strTimeoutDuration = 5 #5 seconds.  This obtained previously in my script but hard coding for this example.
strTimeout = "timeout=" + strTimeoutDuration
subprocess.run(['notepad.exe'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=strTimeoutDuration)

Cheers,
J

[snippsat]

Timeout is a parameter in the function call,just set time there.

from subprocess import check_output

out = check_output(['ping', 'google.com'], timeout=5)
print(out.decode('utf-8').strip())

Output:
Pinging google.com [172.217.22.174] with 32 bytes of data:
Reply from 172.217.22.174: bytes=32 time=26ms TTL=56
Reply from 172.217.22.174: bytes=32 time=22ms TTL=56
Reply from 172.217.22.174: bytes=32 time=23ms TTL=56
Reply from 172.217.22.174: bytes=32 time=25ms TTL=56

Ping statistics for 172.217.22.174:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 22ms, Maximum = 26ms, Average = 24ms

Here it goes fine because the process finish before 5-sec.

from subprocess import check_output
import subprocess

out = check_output(['ping', '-n', '10', 'google.com'], timeout=5)
print(out.decode('utf-8').strip())

Error:
Traceback (most recent call last):
  File "C:\Python36\lib\subprocess.py", line 405, in run
  ........
subprocess.TimeoutExpired: Command '['ping', '-n', '10', 'google.com']' timed out after 5 seconds

Here it use longer than 5-sec,and get a subprocess.TimeoutExpired,
This error be catch an give a better message.

from subprocess import check_output

try:
    out = check_output(['ping', '-n', '10', 'google.com'], timeout=5)
    print(out.decode('utf-8').strip())
except subprocess.TimeoutExpired:
    print('Process ran too long and got timed out')

Output:
Process ran too long and got timed out