题解 | #四则运算#
四则运算
https://www.nowcoder.com/practice/9999764a61484d819056f807d2a91f1e
str = input()
str = str.replace('{','(')
str = str.replace('}',')')
str = str.replace('[','(')
str = str.replace(']',')')
result = int(eval(str))
print(result)知识点：eval() 函数用来执行一个字符串表达式，并返回表达式的值
