# Flipping a Coin in Python

There are many ways to create a coin flipper, but there is an elegant way, using the **singleton design pattern**. In brief, singletons mean that you instantiate a single object from a class at one time, in this case, its heads or tails.

**Setup:**

`from enum import Enum, auto`

import random

Enum: is our data type.

Auto: assign value starting from 1.

Random: is a pseudo-random number generator.

**Create a coin:**

classCoin(Enum):

heads = auto()

tails = auto()list(Coin) #=> [<Coin.heads: 1>, <Coin.tails: 2>]

The class coin has two variables (heads and tails).

Heads have the value 1, while tails have the value 2.

**Creating the Flip Function:**

defflip() -> Coin:

return random.choice(list(Coin))flip() #=> <Coin.heads: 1>

The function flip utilizes the choice method from the random library.

Create a list of flips.

**Runtime:**

`heads_list = [flip() for _ in range(1000)]`

heads_list.count(Coin.heads) #=> 514

heads_list.count(Coin.tails) #=> 486

Using a comprehension list of 1000 flips.

We get the following count; the values are almost 50–50 because the choice function produces a uniform distribution (where each value is equally likely to be picked).

Use enum to create a singleton when you have a list of defined constants, and you want to draw a single object.