Re-add Basic Example for text generation with Vertex AI SDK for Gemini 2.0 Flash

Used in https://cloud.google.com/vertex-ai/generative-ai/docs/migrate-to-v2

Author: holtskinner

generative_ai/text_generation/text_example01.py

@@ -0,0 +1,47 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import os
+
+PROJECT_ID = os.getenv("GOOGLE_CLOUD_PROJECT")
+
+
+def generate_from_text_input() -> str:
+    # [START generativeaionvertexai_gemini_generate_from_text_input]
+    import vertexai
+    from vertexai.generative_models import GenerativeModel
+
+    # TODO(developer): Update and un-comment below line
+    # PROJECT_ID = "your-project-id"
+    vertexai.init(project=PROJECT_ID, location="us-central1")
+
+    model = GenerativeModel("gemini-2.0-flash-001")
+
+    response = model.generate_content(
+        "What's a good name for a flower shop that specializes in selling bouquets of dried flowers?"
+    )
+
+    print(response.text)
+    # Example response:
+    # **Emphasizing the Dried Aspect:**
+    # * Everlasting Blooms
+    # * Dried & Delightful
+    # * The Petal Preserve
+    # ...
+
+    # [END generativeaionvertexai_gemini_generate_from_text_input]
+    return response.text
+
+
+if __name__ == "__main__":
+    generate_from_text_input()