package - Django simple math captcha , how to pass question_tmpl as placeholder -


when using simple math catpcha , how can define custom value displayed, default 1 

"what %(num1)i %(operator)s %(num2)i?"

and want pass placeholder , did this

self.fields['captcha'].widget.attrs['placeholder'] = = "what %(num1)i %(operator)s %(num2)i?"

but doesnt return numbers, whole string, renders %(num1)i %(operator)s %(num2)i?, want show whats 5 + 3, ideas why isnt working ?


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