def which_etree():
which_etree = None<EOL>if '<STR_LIT>' in etree.__file__:<EOL><INDENT>which_etree = '<STR_LIT>'<EOL><DEDENT>elif '<STR_LIT>' in etree.__file__:<EOL><INDENT>which_etree = '<STR_LIT>'<EOL><DEDENT>elif '<STR_LIT>' in etree.__file__:<EOL><INDENT>which_etree = '<STR_LIT>'<EOL><DEDENT>return which_etree<EOL>
decipher which etree library is being used by OWSLib