Basic Calculation Python

Question

Input the math expression such as 3+2*{1+2*[-4/(8-6)+7]} make the python program calculate. The problem is, it gives no output. How to fix this problem.

while True:
 try:
 express = input()
 express.replace("[", "(")
 express.replace("{", "(")
 express.replace("]", ")")
 express.replace("}", ")")
 print(eval(express))
 except:
 break

Answer 1

Update: After each replacement, we must update the expression, otherwise the change will only reflect to the given expression & after each replace statement it will change and only modify the given expression

while True:
 try:
 express = input()
 x = express.replace("[", "(")
 y = x.replace("{", "(")
 z = y.replace("]", ")")
 w = z.replace("}", ")")
 print(eval(w))
 except:
 break

• Eric Cao: The input with "[" "{" is the requirement of this question
• Claus: This answer could use some explanatory text.
• Jake: instead, you should redefine the express variable to make the program more efficient, instead of constantly creating new variables.