random.randint() not exists in esp8266 ?

[VladVons]

in ESP32 there is a random.randint() function
in ESP866 no.

how to get any randomize value in ESP866 ?

[Christian Walther]

As far as I recall, random.getrandbits() is the only function available on ESP8266 (check help(random)). You can build anything else you need on top of that. Here’s a ready-to-use example.

[VladVons]

thanks Christian
got it

[Andrewski]

I found the below from this topic: viewtopic.php?t=6158

Code: Select all

import urandom

def randint(min, max):
    div = 0x3fffffff // span
    span = max - min + 1
    offset = urandom.getrandbits(30) // div
    val = min + offset
    return val

[Christian Walther]

This doesn’t work for several reasons.

• Lines are in the wrong order (variable is used before assignment).
• It gives you values outside of the requested range (try with min = 0, max = 0x1fffffff, getrandbits(30) = 0x3fffffff).
• It doesn’t give you a uniform distribution, some values are more likely than others.

The version on micropython-lib I linked above is correct.