<img src="https://steemit-production-imageproxy-thumbnail.s3.amazonaws.com/U5drxhdemuq4r4ezSCFC6xhAknvQspB_1680x8400">

#### Powering up
***

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
***

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
***

```python
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
****

![Screen Shot 2018-03-01 at 14.29.50.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1519903918/aldpmg7pblf2uc5ij1ec.png)
<center><sup>Seems like I was good powering-up on February!</sup></center>

***

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.