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Ethereum EIP20 Token Interface

Project description

This is a tiny library leveraging web3.py to make an interface for working with EIP20 tokens on Ethereum. (formerly ERC20)

It is currently in Alpha, with 0 automated tests

Usage

Install

virtualenv -p python3 venv
. venv/bin/activate
pip install --pre ethtoken

Initialize

from ethtoken import token

# Use the ENS name that points to your token contract here:
omg = token("omg.thetoken.eth")

Use standard EIP20 methods

Most EIP20 methods are optional. ethtoken makes no attempt to verify which methods are implemented by a token contract.

Here’s an example with all the read functions working:

>>> omg.name()
'OMGToken'

>>> omg.symbol()
'OMG'

>>> omg.decimals()
18

>>> omg.totalSupply()
140245398245132780789239631

# Use the ENS name of the owner address here:
>>> omg.balanceOf('ethereumfoundation.eth')
308744633639977714804

Custom methods

ethtoken has a single custom method not in the EIP20 spec: token_balance.

>>> omg.token_balance("ethereumfoundation.eth")
Decimal('308.744633639977714804')

It returns the balance of an address, with the decimal point shifted according to the decimals() value on the contract. In other words, it is the human-readable number of tokens that the given address owns.

Completely Untested: Transfers

In theory, you could use this to send a token. I haven’t even tried it once yet. Just don’t use it. If you’re going to ignore me, don’t blame me if you lose tokens or ether.

This should theoretically transfer 1 giga units from 0x0 to 0xdead. (That’s 1 nanotoken, at 18 decimals). Of course, this won’t work if you don’t control the 0x0 address. (hint: you don’t)

from web3 import Web3

>>> omg.transfer(
  '0x000000000000000000000000000000000000dEaD',
  10 ** 9,
  transact={
    'from': '0x0000000000000000000000000000000000000000',
    'gasPrice': Web3.toWei('0.1', 'gwei'),
  },
)

Ownership Disclosure

I own some OmiseGo tokens, because anyone who had some ether during their airdrop got some. I don’t have any opinions on the company or token.

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