*b in python code example

Example 1: python b before string

# It means it's a byte string.
# Which means it'll just print b'string' if you try to print it out
string = b'Random string'
print(string)
string_without_b = string.decode()
print(string_without_b)

Example 2: arithmetic operators in python

Arithmetic operators: Arithmetic operators are used to perform mathematical 
  operations like addition, subtraction, multiplication and division.