robotframework自带变量

Variable	Explanation	Available
$	The name of the current test case.	Test case
@	Contains the tags of the current test case in alphabetical order. Can be modified dynamically using Set Tags and Remove Tags keywords.	Test case
$	The documentation of the current test case. Can be set dynamically using using Set Test Documentation keyword.	Test case
$	The status of the current test case, either PASS or FAIL	Test teardown
$	The message of the current test case.	Test teardown
$	The name of the previous test case, or an empty string if no tests have been executed yet.	Everywhere
$	The status of the previous test case: either PASS, FAIL, or an empty string when no tests have been executed.	Everywhere
$	The possible error message of the previous test case.	Everywhere
$	The full name of the current test suite.	Everywhere
$	An absolute path to the suite file or directory.	Everywhere
$	The documentation of the current test suite. Can be set dynamically using using Set Suite Documentation keyword.	Everywhere
&	The free metadata of the current test suite. Can be set using Set Suite Metadata keyword.	Everywhere
$	The status of the current test suite, either PASS or FAIL.	Suite teardown
$	The full message of the current test suite, including statistics.	Suite teardown
$	The status of the current keyword, either PASS or FAIL.	User keyword teardown
$	The possible error message of the current keyword.	User keyword teardown
$	Current log level.	Everywhere
$	An absolute path to the output file.	Everywhere
$	An absolute path to the log file or string NONE when no log file is created.	Everywhere
$	An absolute path to the report file or string NONE when no report is created.	Everywhere
$	An absolute path to the debug file or string NONE when no debug file is created.	Everywhere
$	An absolute path to the output directory.	Everywhere
&	A dictionary exposing command line options. The dictionary keys match the command line options and can be accessed both like ${OPTIONS}[key] and ${OPTIONS.key}. Available options: - ${OPTIONS.exclude} (:option:--exclude) - ${OPTIONS.include} (:option:--include) - ${OPTIONS.skip} (:option:--skip) - ${OPTIONS.skip_on_failure} (:option:--skiponfailure)	Everywhere