This tutorial is part of a series where different aspects of programming with steem-python are explained. Links to the other tutorials can be found in the curriculum section below. The wallet on Steemit.com shows the account value based on the 3 day moving average of the Steem price and it also assumes that 1 SBD is worth 1 dollar. This tutorial will learn you how to calculate the value of your account based on current market prices for both Steem and SBD.
https://github.com/steemit/steem-python
steem-pythonDownload the file from Github. There is 1 file account_value.py which contains the code. The file takes 1 argument from the command line which sets the account for which the market value will be calculated.
Run scripts as following:
> python account_value.py steempytutorials
Coinmarketcap.com is a popular website that has data for over 1600 different crypto assets including Steem and SBD. There is an API interface which allows for easy access to current market prices.
import json, requests
def get_market_price(token):
api_url = 'https://api.coinmarketcap.com/v1/ticker/{}/'.format(token)
response = requests.get(api_url)
if response.status_code == 200:
return json.loads(response.content.decode('utf-8'))[0]['price_usd']
else:
return None
In order to retrieve the current data for a specific token an API request has to be made. The request is made up out of an url, the syntax that Coinmarketcap uses is as follows https://api.coinmarketcap.com/v1/ticker/<token name>. This will return a json object, which after decoding shows the following:
[{
'id': 'steem',
'name': 'Steem',
'symbol': 'STEEM',
'rank': '30',
'price_usd': '3.84594',
'price_btc': '0.00039802',
'24h_volume_usd': '15486900.0',
'market_cap_usd': '977568942.0',
'available_supply': '254182057.0',
'total_supply': '271156151.0',
'max_supply': None,
'percent_change_1h': '-0.16',
'percent_change_24h': '-4.08',
'percent_change_7d': '-5.93',
'last_updated': '1525448347'
}]
The data for price_usd is contained inside a dict that is inside a list. [0]['price_usd'] will retrieve the data.
Steem-python has a function account.get_balances() that is part of the Account class which can be used to retrieve all account balances for a specific account.
from steem.account import Account
account = Account(str(username), s)
for key, value in account.get_balances()['total'].items():
if key not in stats:
stats[key] = value
Running the function will return a dict containing all the balances for the account. To calculate the total account value data under total is needed. Steem Power is listed as VESTS and has to be converted into the Steem Power equivalent.
{
'available': {
'STEEM': 11.705,
'SBD': 1.302,
'VESTS': 136673.580674
},
'savings': {
'STEEM': 0.0,
'SBD': 0.0
},
'rewards': {
'STEEM': 0.0,
'SBD': 0.0,
'VESTS': 0.0
},
'total': {
'STEEM': 11.705,
'SBD': 1.302,
'VESTS': 136673.581
}
}
To convert VESTS to Steem the ratio between total_vesting_shares and total_vesting_fund_steem has to be calculated and then multiplied with the amount of VESTS. The Steem class contains the function get_dynamic_global_properties that allows this data to be retrieved. The Amount class will be used to make the data usable for calculations.
from steem.amount import Amount
data = s.get_dynamic_global_properties()
total_vesting_shares = Amount(data["total_vesting_shares"]).amount
total_vesting_fund_steem = Amount(data["total_vesting_fund_steem"]).amount
ratio = total_vesting_fund_steem/total_vesting_shares
A lot of useful information about the steem blockchain can be found in this manner. However only total_vesting_shares and total_vesting_fund_steem are needed for this tutorial.
{
'id': 0,
'head_block_number': 22139173,
'head_block_id': '0151d125dd33013110dff3fd612497682ac4cd82',
'time': '2018-05-04T16:00:15',
'current_witness': 'smooth.witness',
'total_pow': 514415,
'num_pow_witnesses': 172,
'virtual_supply': '271157259.064 STEEM',
'current_supply': '267866951.902 STEEM',
'confidential_supply': '0.000 STEEM',
'current_sbd_supply': '12921036.227 SBD',
'confidential_sbd_supply': '0.000 SBD',
'total_vesting_fund_steem': '191058886.451 STEEM',
'total_vesting_shares': '389019963857.433024 VESTS',
'total_reward_fund_steem': '0.000 STEEM',
'total_reward_shares2': '0',
'pending_rewarded_vesting_shares': '381908260.635943 VESTS',
'pending_rewarded_vesting_steem': '186156.473 STEEM',
'sbd_interest_rate': 0,
'sbd_print_rate': 10000,
'maximum_block_size': 65536,
'current_aslot': 22204805,
'recent_slots_filled': '340282366920938463463374607431768211455',
'participation_count': 128,
'last_irreversible_block_num': 22139156,
'vote_power_reserve_rate': 10,
'current_reserve_ratio': 45937724,
'average_block_size': 16006,
'max_virtual_bandwidth': '60693185550090240000'
}
Running the script will fetch current market prices for Steem and SBD and retrieve the total account balances for Steem, SBD and Steem Power. In the end the dollar value of all assets will be displayed.
python account_value.py steempytutorials
...
Steem/USD: 2.26
SBD/USD: 1.69
Steem: 4.786
SBD: 1.312
Steem Power: 52.874
Dollar value: 132.52
The code for this tutorial can be found on GitHub!
This tutorial was written by 
