Here is my task.
Given a string consisting of n digits (single digits), between costs n-1 characters of operations, each of which can be either + or -. Calculate the value of this expression. The program must print the result of the calculation of this expression
Here is my code but it doesn’t work
a = "1++++5++++3----2----9".replace("++++", "+").replace("----", "-")
print(int(str(a)))
ValueError: invalid literal for int() with base 10: ‘1+5+3-2-9’
>Solution :
In Python, in order to evaluate an expression you have to use the eval() function.
Side Note: The replace() method returns a str. So, you don’t have to cast it to str
So, the resultant code is as follows
a = "1++++5++++3----2----9".replace("++++", "+").replace("----", "-")
print(eval(a))
Output
-2