Python primer, error code-CodePudding

Why would an error here, when the len (true_case) with len (prec_case) without error

CodePudding user response:

Prec_case set is empty, can't pop

CodePudding user response:

reference 1st floor weixin_45903952 response:

prec_case set is empty, can't pop

why he is empty?

CodePudding user response:

reference 1st floor weixin_45903952 response:

prec_case set is empty, can't pop

with len (prec_case) and not an error?

CodePudding user response:

reference 1st floor weixin_45903952 response:

prec_case set is empty, can't pop

with len (prec_case) and not an error?

CodePudding user response:

reference 4 floor ChenM19951018 response:

Quote: reference 1st floor weixin_45903952 response:
prec_case set is empty, can't pop

with len (prec_case) and not an error?

If len is 0, that is an empty set