Python JAM Codec

Description

Python implementation of the JAM codec as specified in the graypaper.

Installation

pip install jamcodec

Code examples

from jamcodec.types import JamBytes, Bool, String, U32, U8, U16, Struct, Vec, VarInt64, Tuple, Enum

# encode a Vec<u16>
obj = Vec(U16).new()
value = [1, 2]
data = obj.encode(value)

# Define and decode a Struct
scale_obj = Struct(test=U8, test2=Tuple(U8, U8)).new()
value = scale_obj.decode(JamBytes("0x020105"))

# Define and encode an Enum
scale_obj = Enum(
    Bool=Bool(),
    Number=U32,
    Complex=Struct(data=String(), version=VarInt64),
    None_=None
).new()
value = {'Bool': True}

data = scale_obj.encode(value)

Examples of different types