Math Interpreter

Python already supports math, whereby you can write code to add, subtract, multiply, or divide values and even variables. But let’s write a program that enables users to do math, even without knowing Python.

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.

Note that, just as python itself is an interpreter for Python, so will your interpreter.py be an interpreter for math!

Hints

Recall that a str comes with quite a few methods, per docs.python.org/3/library/stdtypes.html#string-methods, including split, which separates a str into a sequence of values, all of which can be assigned to variables at once. For instance, if expression is a str like 1 + 1, then

x, y, z = expression.split(" ")

will assign 1 to x, + to y, and 1 to z.

Demo

Before You Begin

Log into code.cs50.io, click on your terminal window, and execute cd by itself. You should find that your terminal window’s prompt resembles the below:

Next execute

mkdir interpreter

to make a folder called interpreter in your codespace.

Then execute

cd interpreter

to change directories into that folder. You should now see your terminal prompt as interpreter/ $. You can now execute

code interpreter.py

to make a file called interpreter.py where you’ll write your program.

How to Test

Here’s how to test your code manually:

Run your program with python interpreter.py. Type 1 + 1 and press Enter. Your program should output:
```
2.0 
```
Run your program with python interpreter.py. Type 2 - 3 and press Enter. Your program should output:
```
-1.0
```
Run your program with python interpreter.py. Type 2 * 2 and press Enter. Your program should output
```
4.0
```
Run your program with python interpreter.py. Type 50 / 5 and press Enter. Your program should output
```
10.0
```