Token missing

[leonardoARoman]

I am using python2.7 and python3 and yelpapi 2.20.1 I think. Now, this is my first time using Yelp and I am kind of clueless so please bear with me. I've tried two different methods and I get two different errors
METHOD 1:
from yelpapi import YelpAPI
from pprint import pprint
import argparse
key = 'my_key'
yelp_api = YelpAPI(key)
#search_results = yelp_api.search_query(term='ice cream', location='austin, tx', sort_by='rating', limit=5)
#response = yelp_api.search_query(categories='bikerentals', longitude=-122.4392, latitude=37.7474, limit=5)
response = yelp_api.phone_search_query(phone='+13193375512')

This will give me the following error:
{'error': {'code': 'TOKEN_MISSING', 'description': 'An access token must be supplied in order to use this endpoint.'}}

METHOD 2:
from yelpapi import YelpAPI
from pprint import pprint
import argparse
key = 'my_key'
argparser = argparse.ArgumentParser(description='Example Yelp queries using yelpapi. '
'Visit https://www.yelp.com/developers/v3/manage_app to get the '
'necessary API keys.')
argparser.add_argument(key, type=str, help='Yelp Fusion API Key')
args = argparser.parse_args()

yelp_api = YelpAPI(args.api_key)

This will give me the following error where app.py is my python code and my_key the actual key:
usage: app.py [-h]
my_key
app.py: error: too few arguments

I've even try to query from Postman and still can get a result! this is what I get from Postman:

{
"error": {
"code": "TOKEN_MISSING",
"description": "An access token must be supplied in order to use this endpoint."
}
}

Thanks in advance