Topic: iceland secp256k1 import in python (Read 313 times)

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perfect
thanks a lot

https://github.com/iceland2k14/secp256k1/blob/main/secp256k1.py

you can only use what's available or develop and extend the program and contribute to the project

Can't find function for scalar. Only mul pub to priv, no function priv * priv for ex.

RTFM and see what functions are available and how they are used?

https://github.com/iceland2k14/secp256k1/blob/main/README.md

 :-XHow to use this lib for scalar to scalar/number's multiplication , addition, substraction ?

what function of modular inversion ?

Br

yes there is. I have written a patch that allows you to import iceland's secp256k1 module from any folder
==> PATCH <==



You can get the patch or clone the patched version from my git repository.

Without the patch, it would be necessary to change to the directory where iceland's secp256k1 files are located. Then you would run Python console with "python" or "python3" and import the module with:
this only works because in the current working directory the file "secp256k1.py" exists and also the required shared library "ice_secp256k1.so" is located there. If you would try to start the Python console from another directory and load the module, it would fail with an error as you already noticed.

With the patch you can do it from any working directory, it doesn't matter then which is your working directory. The module will always find its required shared library "ice_secp256k1.so".

Additional note:

Since many users use both the standard Python module secp256k1 as well as iceland2k14/secp256k1 I would personally recommend renaming iceland's module to e.g. ice_secp256k1. Because the two modules are different. This will prevent you from shadowing the other module when importing one of the two modules.

I myself have placed all 3rd party python modules in ~/foo/python/modules
Iceland's secp256k1 module is located in ~/foo/python/modules/ice_secp256k1

To allow Python to search for modules in ~/foo/python/modules you can use the PYTHONPATH environment variable:
As you do not want to do this on each system start or terminal start it is suggested to add the export command mentioned above in your ~/.bashrc so it is executed each time you login or start a new terminal. You can ensure that everything is correct by

Whenever I need iceland's secp256k1 module, I import it like that:

Whenever I need Python's standard module "secp256k1" I just ue

This way you can clearly distinguish between the two modules with the same name and you do not run the risk of confusion and problems.

Python has a "get home folder" and "get current directory" functions in tho os module, you can look into those. Especially if you never change directories and just want your CWD to be the same folder your binary (and libs) are located at.

fantastic now works
thanks.

is there more elegant way to solve this?

I am not a Python expert, but as far as I understand it correctly, it is because the library is not found. Look at line 27 of secp256k1.py there you can see how iceland tries to load the needed ice_secp256k1.so file. You could try to put the absolute path there, e.g. like this:

this should work but I bet there is a more convenient and best-practice way to achieve this. You will certainly get some better ideas on this from other users...

i downloaded
https://github.com/iceland2k14/secp256k1

into directory /home/yin4/secp256k1


when i am inside this directory it works good and i can import with command

but i want to have this working also if i start python3 console from /other/directory

i created sys environment variable

then I press tab but no commands available only these:

then i try


what is wrong how can i fix and use library from all directorys?