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how to overcome pinentry of gpg using python when we run an gpg command in python script

I tried the following code which is working perfect, but it's not taking my passphrase. when I run this code I get a popup which asks to enter the passphrase for every time I run the python code in new cmd. But I want to automate this. So please suggest a better option to take passphrase for python script itself.
from subprocess import PIPE, Popen
output_file_name = 'abc.zip'
input_file_name = 'abc.zip.pgp'
args = ['gpg', '-o', output_file_name, '--decrypt', input_file_name]
proc = Popen(args, stdin=PIPE, stdout=PIPE, stderr=PIPE,shell=True)
proc.stdin.write('passphrase\n')
proc.stdin.flush()
stdout, stderr = proc.communicate()
print(stdout)
print(stderr)

I want to check the DNS value from my system

I want to check the DNS value from my system.
If the command goes wrong, the error should be stored in a different variable.
This is what I have so far:
proc = subprocess.Popen(['echo', '"to stdout"'], stdout=subprocess.PIPE,)
stdout_value = proc.communicate()
print '\tstdout:', repr(stdout_value)
subprocess.call('echo #user', shell=True)
#subprocess.check_call('echo #HOME', shell=True)

You should try this :
It captures errorcode, stdout and stderr from a command you passed as an argument :
import shlex
from subprocess import Popen, PIPE
def get_exitcode_stdout_stderr(cmd):
"""
Execute the external command and get its exitcode, stdout and stderr.
"""
args = shlex.split(cmd)
proc = Popen(args, stdout=PIPE, stderr=PIPE)
out, err = proc.communicate()
exitcode = proc.returncode
#
return exitcode, out, err
cmd = "..." # arbitrary external command, e.g. "python mytest.py"
exitcode, out, err = get_exitcode_stdout_stderr(cmd)
For your need, I think you can use a python module to get what you want instead of using the bash cmd line. For example, to get your fully qualified domain name you can use :
socket.getfqdn()

python subprocess with openssl

I'm having a lot of trouble passing a string to the openssl commandline tool via python's subprocess like this:
process = subprocess.Popen(
["openssl", "rsa", "-in", pathFile, "-out", "id_rsa.out"],
stdin = subprocess.PIPE,
stdout = subprocess.PIPE,
stderr = subprocess.PIPE,
shell=False
)
try:
process.communicate("some passphrase\n", timeout=2)
except:
process.kill() #openssl stays alive otherwise.
The code above times out (with and without the std redirection in the Popen). I can use openssl normally through the terminal just fine, but I really need to be able to run this as part of my python script.
Any help would be appreciated.

The section PASS PHRASE ARGUMENTS on the openssl man page explains how the passphrase input mechanism works. To make your example work, you should tell openssl to take the passphrase from stdin. Using your example as a starting point, the following works for me:
process = subprocess.Popen(
["openssl", "rsa", "-in", pathFile, "-out", "id_rsa.out", "-passin", "stdin"],
stdin = subprocess.PIPE,
stdout = subprocess.PIPE,
stderr = subprocess.PIPE,
shell=False
)
process.communicate("passphrase\n")

Invoke pstools in Python script

I am trying to invoke pstools (specifically, psloggedon.exe) in my Python script
import sys, subprocess, socket, string
import wmi, win32api, win32con
pst = subprocess.Popen(
["D:\pstools\psloggedon.exe", "-l", "-x", "\\10.10.10.10"],
stdout = subprocess.PIPE,
stderr = subprocess.PIPE
)
out, error = pst.communicate()
print pst, "is output"
This is the output
<subprocess.Popen object at 0x0000000002B18D68> is output
I would like the output to be
DOMAIN\user
Thank You

If you want to print the output then you have to use print out, "is output" instead of print pst, "is output" because out will contain the output.

Not able to fetch log files from shell using python

I am trying to use subprocess module with Popen to fetch log from a specified URL, However, I am not able to fetch the log and the program returns me a blank.
I have been using the below mentioned code:
import subprocess
url = r'C:\project\dummy\pro'
mycmd = ['svn', 'log', url]
log = subprocess.Popen(mycmd, shell=True,
stdin = subprocess.PIPE, stdout = subprocess.PIPE,
stderr = subprocess.PIPE)
result = log.wait()
out1, err = log.communicate()
print out1
I need the output string to use as next part of the program. Any help would be appreciated.

Try without shell=True:
log = subprocess.Popen(mycmd,
stdin = subprocess.PIPE, stdout = subprocess.PIPE,
stderr = subprocess.PIPE)