Created
June 26, 2021 12:37
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import json | |
import requests | |
import pandas as pd | |
from datetime import datetime | |
from prefect import task, Flow, Parameter | |
from prefect.schedules import CronSchedule | |
@task | |
def extract(url: str) -> dict: | |
res = requests.get(url) | |
if not res: | |
raise Exception('No data fetched!') | |
return json.loads(res.content) | |
@task | |
def transform(data: dict) -> pd.DataFrame: | |
transformed = [] | |
for user in data: | |
transformed.append({ | |
'ID': user['id'], | |
'Name': user['name'], | |
'Username': user['username'], | |
'Email': user['email'], | |
'Address': f"{user['address']['street']}, {user['address']['suite']}, {user['address']['city']}", | |
'PhoneNumber': user['phone'], | |
'Company': user['company']['name'] | |
}) | |
return pd.DataFrame(transformed) | |
@task | |
def load(data: pd.DataFrame, path: str) -> None: | |
data.to_csv(path_or_buf=path, index=False) | |
scheduler = CronSchedule( | |
cron='* * * * *' | |
) | |
def prefect_flow(): | |
with Flow(name='simple_etl_pipeline', schedule=scheduler) as flow: | |
param_url = Parameter(name='p_url', required=True) | |
users = extract(url=param_url) | |
df_users = transform(users) | |
load(data=df_users, path=f'data/users_{int(datetime.now().timestamp())}.csv') | |
return flow | |
if __name__ == '__main__': | |
flow = prefect_flow() | |
flow.run(parameters={ | |
'p_url': 'https://jsonplaceholder.typicode.com/users' | |
}) |
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