Cant use get chart function in blockchain python client

Question

Trying to run

import blockchain 
from blockchain import statistics 
get_chart(chart_type="mempool-size", time_span="1year")

Gives a function not defined error, despite get_chart being defined in the statistics.py file for the blockchain.info client. How can I run the get_chart function?

Does anyone have any troubleshooting ideas? 

I'm happy with any python solution that can get chart data from https://blockchain.info

Answer 1

As you said, get_chart is defined in blockchain.statistics, but importing the statistics module does bring its members into the global namespace. You have to dot off of it to access its members, such as get_chart:

from blockchain import statistics 
statistics.get_chart(chart_type="mempool-size", time_span="1year")

Alternatively you can import the function directly:
 

from blockchain.statistics import get_chart 
get_chart(chart_type="mempool-size", time_span="1year")

Unfortunately, that won't solve the larger issue at hand which is that the repository for the package appears to be abandoned. For your request, it tries to access data from the URL https://blockchain.info/charts/mempool-size?format=json&timespan=1year, which results from it downloading an HTML page instead of JSON.

Still, you can access the charts API using the docs provided here: https://www.blockchain.com/api/charts_api

For your request, the correct URL to use is: https://api.blockchain.info/charts/mempool-size?format=json&timespan=1year

You can download it and parse the JSON into a dictionary like so:
 

import json 
from 
urllib.request import urlopen url = 'https://api.blockchain.info/charts/mempool-size?format=json&timespan=1year' 
data = json.loads(urlopen(url).read())