def addOperators(self, num, target):
        ret = []
        self.dfs(num, target, 0, "", 0, 0, ret)
        return ret
Pops all transient tokens - i.e. not blocks, literals, or parens.
dataset/ETHPy150Open algorhythms/LeetCode/282 Expression Add Operators.py/Solution.addOperators--crossover with--dataset/ETHPy150Open google/closure-linter/closure_linter/indentation.py/IndentationRules._PopTransient