Get varible name from rule

[kaiwang0112006]

After building a rule like

rule = rule_engine.Rule('a>0.5')

Is there a build-in method that can reture the varible name of the rule, like

rule.get_var()
>>> 'a'

[zeroSteiner]

Yes, take a look at rule.context.symbols:

In [1]: import rule_engine                                                                                                                                                                                                                                                                                                                                                 

In [2]: rule = rule_engine.Rule('a>0.5')                                                                                                                                                                                                                                                                                                                                   

In [3]: rule.context                                                                                                                                                                                                                                                                                                                                                       
Out[3]: <rule_engine.engine.Context at 0x7f07cf52a350>

In [4]: rule.context.symbols                                                                                                                                                                                                                                                                                                                                               
Out[4]: {'a'}