Python SDK | API call returning zero results

Python SDK | API call returning zero results

Hello 
I'm trying to fetch records from my Contacts and Leads database in Zoho CRM. As of now, the account is only populated with sample from Zoho.
I've read all the documentation but cannot understand why the call is returning zero results.
Can you help?
thank you

from zcrmsdk import ZCRMRecord, ZCRMRestClient
import json

config = {
"sandbox":"False",
"client_id":"hidden",
"client_secret":"hidden",
"redirect_uri":"http://localhost:8000/some_path",
"accounts_url":"https://accounts.zoho.com",
"token_persistence_path":".",
"currentUserEmail":"qualqueremail@gmail.com"
}

ZCRMRestClient.initialize(config)

def get_records(self):
module_ins = ZCRMModule.get_instance('Contacts') # module API Name
resp = module_ins.get_records()
print(resp.status_code)
record_ins_arr = resp.data
for record_ins in record_ins_arr:
print(record_ins.entity_id)
print(record_ins.owner.id)
print(record_ins.created_by.id)
print(record_ins.modified_by.id)
print(record_ins.created_time)
print(record_ins.modified_time)
product_data = record_ins.field_data
for key in product_data:
print(key + ":" + str(product_data[key]))
print("\n\n")