PythonExtra/docs/library/random.rst

random -- generate random numbers

random

This module implements a pseudo-random number generator (PRNG).

python:random .

Note

The following notation is used for intervals:

• () are open interval brackets and do not include their endpoints. For example, (0, 1) means greater than 0 and less than 1. In set notation: (0, 1) = {x | 0 < x < 1}.
• [] are closed interval brackets which include all their limit points. For example, [0, 1] means greater than or equal to 0 and less than or equal to 1. In set notation: [0, 1] = {x | 0 <= x <= 1}.

Note

The randrange, randint and choice functions are only available if the MICROPY_PY_RANDOM_EXTRA_FUNCS configuration option is enabled.

Functions for integers

getrandbits(n)

Return an integer with n random bits (0 <= n <= 32).

randint(a, b)

Return a random integer in the range [a, b].

randrange(stop) randrange(start, stop) randrange(start, stop[, step])

The first form returns a random integer from the range [0, stop). The second form returns a random integer from the range [start, stop). The third form returns a random integer from the range [start, stop) in steps of step. For instance, calling randrange(1, 10, 2) will return odd numbers between 1 and 9 inclusive.

Functions for floats

random()

Return a random floating point number in the range [0.0, 1.0).

uniform(a, b)

Return a random floating point number N such that a <= N <= b for a <= b, and b <= N <= a for b < a.

Other Functions

seed(n=None, /)

Initialise the random number generator module with the seed n which should be an integer. When no argument (or None) is passed in it will (if supported by the port) initialise the PRNG with a true random number (usually a hardware generated random number).

The None case only works if MICROPY_PY_RANDOM_SEED_INIT_FUNC is enabled by the port, otherwise it raises ValueError.

choice(sequence)

Chooses and returns one item at random from sequence (tuple, list or any object that supports the subscript operation).