Variables, strings, arithmetic, and concatenation in Python.

varstrithmetication.py

num1 = 5
num2 = 7

addition = num1 + num2
subtraction = num2 - num1
multiplication = num1 * num2
division = num2 / num1                  # rounds down for integer division

print(addition)                         # prints 12
print(subtraction)                      # prints 2
print(multiplication)                   # prints 35
print(division)                         # prints 1

string1 = "hello"
string2 = "world"

addition = string1 + string2
print(addition)                         # prints "helloworld" (sticks strings together

subtraction = string1 - string2         # gives an error, subtraction/multiplication/division doesn't make sense for strings