eryksun added the comment:
Here's the rationale given for ignoring SHELL in POSIX system():
One reviewer suggested that an implementation of system() might
want to use an environment variable such as SHELL to determine
which command interpreter to use. The supposed implementation
would use the default command interpreter if the one specified
by the environment variable was not available. This would allow
a user, when using an application that prompts for command lines
to be processed using system(), to specify a different command
interpreter. Such an implementation is discouraged. If the
alternate command interpreter did not follow the command line
syntax specified in the Shell and Utilities volume of
POSIX.1-2008, then changing SHELL would render system()
non-conforming. This would affect applications that expected the
specified behavior from system(), and since the Shell and
Utilities volume of POSIX.1-2008 does not mention that SHELL
affects system(), the application would not know that it needed
to unset SHELL.
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<http://bugs.python.org/issue24919>
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