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'

CodePudding user response：

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