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Hello, I just uploaded the latest release for ESP8266 2M+, V1.20. The board is a ESP8266-12F NodeMCU Lolin V3. According to the docs, the "random" module should come with a heap of functions (like randint() or uniform()). However, when trying to access these on my 8266 dev board, it appears only seed() and getrandbits() are present. >>> import random
>>> random.uniform(13, 25)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'uniform'Could someone please tell me what I am missing ? Thanks in advance for your help ! EDIT : I also had a question about espnow, but found my answer, so deleted it |
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Replies: 3 comments 10 replies
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As you tell, the esp8266 random module does implement only a small subset of the random module to save flash space for devices with small memory. Building your own firmware, you can change that by setting:
In the mpconfigport.h of the ESP8266 port, or better in the mpconfigboard.h of the GENERIC board section. Generally, the configuration could be changed to support more features with the 2MB version of the firmware. Only someone has to make the change, test it and make a PR for it. |
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Thank you very much, I will look into it |
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@gbroulet I know you're looking for We might want to consider adding |
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I know this has been answered but for future people like myself wanting randrange: import random
def randrange(start, stop):
return random.getrandbits(16) % (stop + 1 - start) + start |
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Yes. As jimmo said, install random from micropython-lib. |
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Well, that's only a better solution if you're in an environment where you can do that. In my case, I'm using pyscript and (to the best of my knowledge) my only choice is whatever micropython pyscript.net provides. That micropython build does include randrange() and uniform(). But it is missing Random() which would allow me to have different PRNG states for different parts of my process. To be clear, I'm not complaining. I'm using the micropython variant of pyscript because I want to have a lean footprint. I expect/anticipate/encounter some functional shortcomings and work around them. The Lemire algorithm (it's algorithm 5 in that paper) is fast, unbiased, easy to implement, and not too hard to test. If I needed randrange() and it wasn't available, that's what I'd use. |
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@rsharris , in pyscript you can use external modules using MIP or url From pyscript docs, FAQ In MicroPython, the package you want to use has not been ported into the micropython-lib package repository. If you want to use a pure Python package with MicroPython, use the files configuration option to manually copy the package onto the file system, or use a URL to reference the package. |
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@Josverl Thanks, that might be the workaround I need. I'll have to explore that. I did read the FAQ (recently, even) but my memory did not make a connection back to that when I encountered the missing Random(). And it's not exactly the same situation — the package has been ported but it lacks some functionality it has in 'normal' python. Thanks for pointing me at that. |
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When I compare the stubs I created on pyscript/webassembly (v1.24.1 at the time) and for instance rp2 I seen no difference in methods and functions between the two, and both include Do you perhaps have a file named |
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Interesting. No, I don't have a random.py in my project. I'm using To discover what was available in random, in the mpy case, I did |
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As you tell, the esp8266 random module does implement only a small subset of the random module to save flash space for devices with small memory. Building your own firmware, you can change that by setting:
#define MICROPY_PY_URANDOM_EXTRA_FUNCS (1)In the mpconfigport.h of the ESP8266 port, or better in the mpconfigboard.h of the GENERIC board section. Generally, the configuration could be changed to support more features with the 2MB version of the firmware. Only someone has to make the change, test it and make a PR for it.