import requests


class myElsClient:
    """A class that implements a Python interface to api.elsevier.com"""

    # local variables
    __base_url = "http://api.elsevier.com/"
    
    def __init__(self, apiKey):
        """Instantiates a client with a given API Key."""
        self.apiKey = apiKey

    def getBaseURL(self):
        return self.__base_url

import requests


class myElsClient:
    """A class that implements a Python interface to api.elsevier.com"""

    # local variables
    __base_url = "http://api.elsevier.com/"

    # constructors
    def __init__(self, apiKey):
        """Instantiates a client with a given API Key."""
        self.apiKey = apiKey

    # configuration functions
    """Sets an institutional token for customer authentication"""
    def setInstToken(self, instToken):
        self.instToken = instToken

    # utility access functions
    def getBaseURL(self):
        """Returns the base URL currently configured for Elsevier's APIs"""
        return self.__base_url

Add ability to set insttoken