Want to list all the processes for which procdump can't be generated

When I am generating a procdump for various processes, there are some processes which are either system processes or some other processes which throws error and write it in .out file while generating dump.

Writing a dump for the System process is not supported.

and

Error opening csrss.exe (360):

Access is denied. (0x00000005, 5)

Dump is not getting generated for these files. I want to find out all these processes before calling my program and want to generate dump for only those processes for which the dump can be generated.i.e., the processes which doesn't throw any error. What is the good way to find out all these processes beforehand so that I can exclude them? I am using python 2.7.