asana_sum_days.py

import asana
asana_personal_token = ""  # Personal Token
project_id = 0 # Project id
client = asana.Client.access_token(asana_personal_token)

def cumpute_days(section):

    days = 0
    for task in client.tasks.find_by_section(section):
        task_id = task['id']
        task_deatil = client.tasks.find_by_id(task_id)
        for field in task_deatil[u'custom_fields']:
            if field['name'] == 'Days' and field['number_value']:
                days +=field['number_value']
    return days
    
for section in client.sections.find_by_project(956418772713380):
    name = section['name']
    section_id = section['id']
    print name
    print cumpute_days(section_id)

pip install asana

token can be get from here

https://app.asana.com/0/577043048663195/list

document

https://asana.com/developers/documentation/getting-started/quick-start