Sorry, still is incomplete.
As per your mail message, you could try to use:
exe:/usr/bin/python2.7
user:netdata
cmd:/usr/bin/python /usr/libexec/netdata/plugins.d/python.d.plugin 1
This should properly ignore all python processes executing that specific file.
If your netdata command line is not like above, another thing you could try is the argumento to "pcmd" too:
pcmd:*/usr/libexec/netdata/plugins.d/python.d.plugin 1
This will ignore all commands ending in the path of the file, which includes python processes.
Like in:
exe:/usr/bin/python2.7
user:netdata
pcmd:*/usr/libexec/netdata/plugins.d/python.d.plugin 1
So, if it is invoked as "/usr/bin/python2.7" or instead as "/usr/bin/python" (or yet any other), is indifferent, this command could to target them.
And don't forget to restart csf:
# csf -x; csf -e