如何将 str('+') 转化为数学运算？ 例如:
a = [0,1,2] # or a = ['0','1','2']
b = ['+','-','*']
c = int(a[0]+b[0]+a[1])
换句话说，如何将 str('-1*2') 转换为 int()，而无需 for i in c: if i == '+': ... 谢谢。
请您参考如下方法:
您还可以使用运算符(operator)模块:
import operator as op
#Create a mapping between the string and the operator:
ops = {'+': op.add, '-': op.sub, '*': op.mul}
a = [0,1,2]
b = ['+','-','*']
#use the mapping
c = ops[b[0]](a[0], a[1])
