The unique identifier for an entity in the Google Ads API is called a resource name, and is represented as a string with a predictable format. If you know the constituent components of a resource name, you can generate resource names using helper methods present on many Service objects.
Service path methods
All Services that are designed to handle reading or mutating specific types of
objects in the API have helper methods to construct resource_names. For example,
you can create a resource name for a Campaign object:
from google.ads.googleads.client import GoogleAdsClient
client = GoogleAdsClient.load_from_storage()
customer_id = "7892134783"
campaign_id = "1234567890"
campaign_service = client.get_service("CampaignService")
resource_name = campaign_service.campaign_path(customer_id, campaign_id)
Each service also has an accompanying parse_*_path method that deconstructs a
resource_name into its individual segments, for example:
from google.ads.googleads.client import GoogleAdsClient
client = GoogleAdsClient.load_from_storage()
resource_name = "customers/7892134783/campaigns/1234567890"
campaign_service = client.get_service('CampaignService')
segments = campaign_service.parse_campaign_path(resource_name)
customer_id = segments["customer_id"]
campaign_id = segments["campaign_id"]
Composite resource names
Path helpers on services construct composite segments of a resource name. The different segments of the composite ID are accepted as individual parameters in the method:
from google.ads.google_ads.client import GoogleAdsClient
customer_id = "0987654321"
ad_group_id = "1234567890"
criterion_id = "74932"
client = GoogleAdsClient.load_from_storage()
ad_group_criterion_service = client.get_service("AdGroupCriterionService")
# An AdGroupCriterion resource name that uses the above IDs looks like this:
# "customers/0987654321/adGroupCriteria/1234567890~74932"
resource_name = ad_group_criterion_service.ad_group_criterion_path(
customer_id, ad_group_id, criterion_id
)