Hello! Today i will be teaching how to make a calculator!

I am going teach the Eval function way.
This is my method personally, Its very easy and short

First you prompt the user for input like this:
input("Expression: ")

Lets assign that to a variable:
x = input("Expression: ")

EDIT: Be aware that eval excutes any python code that is given. Making eval unsafe.
Now time to actually solve it:
eval(x)

Lets print that out:
print(eval(x))

If you want you can assign it to a variable:
a = eval(x)

And now we can add the finishing touches, Such as while loop and a welcome.

Total code:
print("Welcome! Type any expression and i will solve it")
while True:
x = input("> ")
a = eval(x)
print(a)
And thats it!