sh: test: argument expected and /usr/bin/env

[Jeff Epler]

In the #!-line of a script, everything after the first (white?)space is
taken as the first argument to the named binary, and the filename of the
script is the second argument.  This is standard Unix behavior, nothing
Python-specific.

So your second #! is like executing
    /usr/bin/env "SHELL=/bin/bash python" yourscript.py
which probably causes /usr/bin/env to be invoked again with the same
arguments, indefinitely (because the command is a #!/usr/bin/env script)

You can set environment variables in Python.  Why not add
    import os
    os.environ['SHELL'] = "/bin/bash"
just below the #!-line?

Jeff
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