def env(*vars, **kwargs):
for v in vars:<EOL><INDENT>value = os.environ.get(v)<EOL>if value:<EOL><INDENT>return value<EOL><DEDENT><DEDENT>return kwargs.get('<STR_LIT:default>', '<STR_LIT>')<EOL>
Returns the first environment variable set.

    If none are non-empty, defaults to '' or keyword arg default.