Unit converter

iFA

**edit**
I have modified my code. This is now much better.
**edit**

I have coded Ethereum unit converter for python without any libraries. Supports the most used units: wei, szabo, finney, ether
I would like to share it for everyone, feel free to use:
def convertEthereumUnit(value, fromWei=False, fromSzabo=False, fromFinney=False, fromEther=False, toWei=False, toSzabo=False, toFinney=False, toEther=False, prec=-1): def moveDot(value, prec, pos): value = value.zfill(19) dot = value.find('.') if dot == -1: dot = len(value) value = value.replace('.','') + '0'*19 value = (value[:dot+pos] + '.' + value[dot+pos:]).strip('0') if value[0] == '.': value = '0'+value if prec == 0: value = value[:value.find('.')] elif prec > 0: value += '0'*18 value = value[:value.find('.')+prec+1] else: if value[-1] == '.': value = value[:-1] return value if not type(value) is str: value=str(value) value=value.replace(',','.') if value.count('.') > 1: raise ValueError if fromWei: if toSzabo: return moveDot(value, prec, -12) elif toFinney: return moveDot(value, prec, -15) elif toEther: return moveDot(value, prec, -18) elif fromSzabo: if toWei: return moveDot(value, prec, 12) elif toFinney: return moveDot(value, prec, -3) elif toEther: return moveDot(value, prec, -6) elif fromFinney: if toWei: return moveDot(value, prec, 15) elif toSzabo: return moveDot(value, prec, 3) elif toEther: return moveDot(value, prec, -3) elif fromEther: if toWei: return moveDot(value, prec, 18) elif toSzabo: return moveDot(value, prec, 6) elif toFinney: return moveDot(value, prec, 3) return value

Example for use:
>>> convertEthereumUnit('1234567890123456789', fromWei=True, toEther=True) '1.234567890123456789'
>>> convertEthereumUnit('1234567890123456789', fromWei=True, toEther=True, prec=2) '1.23'

Some assert check:
assert convertEthereumUnit('1000', fromEther=True, toWei=True) == '1000000000000000000000' assert convertEthereumUnit('1000', fromEther=True, toSzabo=True) == '1000000000' assert convertEthereumUnit('1000', fromEther=True, toFinney=True) == '1000000' assert convertEthereumUnit('0.000000000000000001', fromEther=True, toWei=True) == '1' assert convertEthereumUnit('10000000.000000000000000001', fromEther=True, toWei=True) == '10000000000000000000000001' assert convertEthereumUnit('0.000001', fromEther=True, toSzabo=True) == '1' assert convertEthereumUnit('0.001', fromEther=True, toFinney=True) == '1' assert convertEthereumUnit('1000', fromFinney=True, toWei=True) == '1000000000000000000' assert convertEthereumUnit('1000', fromFinney=True, toSzabo=True) == '1000000' assert convertEthereumUnit('1000', fromFinney=True, toEther=True) == '1' assert convertEthereumUnit('0.000000000000001', fromFinney=True, toWei=True) == '1' assert convertEthereumUnit('10000000.000000000000001', fromFinney=True, toWei=True) == '10000000000000000000001' assert convertEthereumUnit('0.001', fromFinney=True, toSzabo=True) == '1' assert convertEthereumUnit('0.1', fromFinney=True, toEther=True) == '0.0001' assert convertEthereumUnit('1000', fromSzabo=True, toWei=True) == '1000000000000000' assert convertEthereumUnit('1000', fromSzabo=True, toFinney=True) == '1' assert convertEthereumUnit('1000', fromSzabo=True, toEther=True) == '0.001' assert convertEthereumUnit('0.000000000001', fromSzabo=True, toWei=True) == '1' assert convertEthereumUnit('10000000.000000000001', fromSzabo=True, toWei=True) == '10000000000000000001' assert convertEthereumUnit('0.000000000001', fromSzabo=True, toFinney=True) == '0.000000000000001' assert convertEthereumUnit('0.000000000001', fromSzabo=True, toEther=True) == '0.000000000000000001' assert convertEthereumUnit('1', fromWei=True, toSzabo=True) == '0.000000000001' assert convertEthereumUnit('1', fromWei=True, toFinney=True) == '0.000000000000001' assert convertEthereumUnit('1', fromWei=True, toEther=True) == '0.000000000000000001' assert convertEthereumUnit('1000', fromWei=True, toSzabo=True) == '0.000000001' assert convertEthereumUnit('1000', fromWei=True, toFinney=True) == '0.000000000001' assert convertEthereumUnit('1000', fromWei=True, toEther=True) == '0.000000000000001'