Calling another process from python/child process need to access shell

Question

Hi,

I'm calling a C/C++ program from python with Popen, python code should observe behavior of child process and collect some data for his own work.

Problem is that C code already uses pipes for calling some shell commands - so after my execution from python, C program cannot execute bash shell command.

Is there any way in calling from Popen to specify that, child process should execute his own pipe command in shell???

I tried with shell=True, but doesn't help!