steem-python tips #1 - Calculating power-ups!

Powering up

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Powering up is a process on steem blockchain where you convert your liquid STEEMs to Steem Power. Every time an account powers up, it broadcast a "transfer_to_vesting" operation to the network.

@sndbox and some other organizations have weekly power-up challenges. And I was lucky to win a couple of them. Today I was curious how much I have powered up in the last month. (I did powered-up a lot.)

Filtering "transfer_to_vesting" ops with steem-python

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Out script's main flow should be like this:

• Get an input with username, start_date, and end_date
• Filter all "transfer_to_vesting" operations between start_date and end_date
• Sum all powered-up amount in corresponding transactions.

And we have the number.

Basic example to filter specific operations:

from steem import Steem
from steem.account import Account
s = Steem(nodes=["https://api.steemit.com"])
acc = Account('emrebeyler', steemd_instance=s)
for op in acc.history_reverse(filter_by=["transfer_to_vesting"]):
    print(op)

This script will filter all "transfer_to_vesting" operations in your entire account history and prints them.

The Calculator script

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from steem import Steem
from steem.account import Account
from steem.amount import Amount
from dateutil.parser import parse
from datetime import datetime
import tableprint as tp
def calculate_powerup(username, start_date, end_date):
    s = Steem(nodes=["https://api.steemit.com"])
    account = Account(username, steemd_instance=s)
    data = []
    total = 0
    for op in account.history_reverse(filter_by=["transfer_to_vesting"]):
        ts = parse(op["timestamp"])
        if ts > end_date:
            continue
        if ts < start_date:
            break
        total += Amount(op["amount"]).amount
        data.append((op["amount"], op["timestamp"]))
    data.append(("Total: %s STEEM" % round(total, 2), "-"))
    return data, total
if __name__ == '__main__':
    data, total = calculate_powerup(
        'emrebeyler',
        datetime(2018, 2, 1),
        datetime(2018, 3, 1),
    )
    tp.table(data, ['Amount', 'Timestamp'], width=32)

Example output

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^{Seems like I was good powering-up on February!}

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You can play with other accounts and timeframes by changing start_date and end_date. Make sure you have steem-python and tableprint libraries installed on your local environment.

Have fun.