题解 | 四则运算
b = list(input())
list1 = []
for i in b:
if i == "{" or i == "[":
i = "("
list1.append(i)
elif i == '}' or i == "]":
i = ")"
list1.append(i)
else:
list1.append(i)
str2 = "".join(list1)
result = eval(str2)
print("{:.0f}".format(result))表达式表达正确
