I am trying to solve the "Math Interptreter" problem of problem set 1 of harvard cs50 python course. The question is: In a file called interpreter.py, implement a program that prompts the user for an arithmetic expression and then calculates and outputs the result as a floating-point value formatted to one decimal place. Assume that the user’s input will be formatted as x y z, with one space between x and y and one space between y and z, wherein: x is an integer y is +, -, *, or / z is an integer For instance, if the user inputs 1 + 1, your program should output 2.0. Assume that, if y is /, then z will not be 0. I did the following: expression=input("Enter the expression: ").replace(" ","") if "+" in expression: operation="+" elif "-" in expression: operation="-" elif "*" in expression: operation="*" else: operation="/" position=expression.find(operation) x=int(expression[osition]) y=int(expression[position:]) print(x) print(operation) print(y) here I tried to remove the spaces and then check which operation is given by the user. Then, I tried to find the position of the operation using the find keyword in order to slice the string into two parts i.e. x (which will contain the fisrt integer) and y (which will contain the second integer). Then I was about to perform the operation. But, the error is that when I enter '55 + 6' as an input, x is assigned as 55 and y is assigned as 6. However, when I enter '55 - 6' as an input, x is assigned as 55 and y is assigned as -6. Why is y assigned as -6? Continue reading...
