我不明白到底需要这段代码的最后一行，请有人解释一下吗？提前致谢！
ops = {'+': operator.add,'-': operator.sub,'*': operator.mul} #creating a dictioanry, using 'operators' built in functions
keys = list(ops.keys()) # ['+', '*', '-'] list The method keys() returns a list of all the available keys in the dictionary.
opt = random.choice(keys) #e.g. '+' randomly choose an operator/key/ from the dictionary
operation = ops[opt]
最佳答案
ops是一本字典
opt是随机密钥
如果opt =“ +”，则ops [opt] = operator.add
您应该看一下python的字典。
关于python - python中的keys()操作说明？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32342783/