Starting April 29, 2025, Gemini 1.5 Pro and Gemini 1.5 Flash models are not available in projects that have no prior usage of these models, including new projects. For details, see Model versions and lifecycle .

Create a parameterized prompt template

This code sample shows how to build a parameterized prompt template to generate content with multiple variable sets.

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For detailed documentation that includes this code sample, see the following:

Vertex AI client libraries

Code sample

Python

Before trying this sample, follow the Python setup instructions in the Vertex AI quickstart using client libraries . For more information, see the Vertex AI Python API reference documentation .

To authenticate to Vertex AI, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  import 
  
  vertexai 
 
 from 
  
 vertexai.preview.prompts 
  
 import 
 Prompt 
 # Initialize vertexai 
  vertexai 
 
 . 
 init 
 ( 
 project 
 = 
 PROJECT_ID 
 , 
 location 
 = 
 "us-central1" 
 ) 
 variables 
 = 
 [ 
 { 
 "animal" 
 : 
 "Eagles" 
 , 
 "activity" 
 : 
 "eat berries" 
 }, 
 { 
 "animal" 
 : 
 "Coyotes" 
 , 
 "activity" 
 : 
 "jump" 
 }, 
 { 
 "animal" 
 : 
 "Squirrels" 
 , 
 "activity" 
 : 
 "fly" 
 } 
 ] 
 # define prompt template 
 prompt 
 = 
 Prompt 
 ( 
 prompt_data 
 = 
 "Do 
 {animal} 
  
 {activity} 
 ?" 
 , 
 model_name 
 = 
 "gemini-2.0-flash-001" 
 , 
 variables 
 = 
 variables 
 , 
 system_instruction 
 = 
 "You are a helpful zoologist" 
 # generation_config=generation_config, # Optional 
 # safety_settings=safety_settings, # Optional 
 ) 
 # Generates content using the assembled prompt. 
 responses 
 = 
 [] 
 for 
 variable_set 
 in 
 prompt 
 . 
 variables 
 : 
 response 
 = 
 prompt 
 . 
  generate_content 
 
 ( 
 contents 
 = 
 prompt 
 . 
  assemble_contents 
 
 ( 
 ** 
 variable_set 
 ) 
 ) 
 responses 
 . 
 append 
 ( 
 response 
 ) 
 for 
 response 
 in 
 responses 
 : 
 print 
 ( 
 response 
 . 
 text 
 , 
 end 
 = 
 "" 
 ) 
 # Example response 
 # Assembled prompt replacing: 1 instances of variable animal, 1 instances of variable activity 
 # Eagles are primarily carnivorous.  While they might *accidentally* ingest a berry......

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Code sample

Python

What's next

Create a parameterized prompt template