Add samples for chat (#408)

* Add samples for chat

* Update chat sample to be more than one round

* multiple send_message calls.

---------

Co-authored-by: Mark Daoust <[email protected]>

Author: shilpakancharla

samples/chat.py

@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+# Copyright 2023 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
+#
+#     http://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.
+from absl.testing import absltest
+
+import google.generativeai as genai
+import pathlib
+
+media = pathlib.Path(__file__).parents[1] / "third_party"
+
+
+class UnitTests(absltest.TestCase):
+    def test_chat(self):
+        # [START chat]
+        model = genai.GenerativeModel("gemini-1.5-flash")
+        chat = model.start_chat(
+            history=[
+                {"role": "user", "parts": "Hello"},
+                {"role": "model", "parts": "Great to meet you. What would you like to know?"},
+            ]
+        )
+        response = chat.send_message("I have 2 dogs in my house.")
+        print(response.text) 
+        response = chat.send_message("How many paws are in my house?")
+        print(response.text)
+        # [END chat]
+
+    def test_chat_streaming(self):
+        # [START chat_streaming]
+        model = genai.GenerativeModel("gemini-1.5-flash")
+        chat = model.start_chat(
+            history=[
+                {"role": "user", "parts": "Hello"},
+                {"role": "model", "parts": "Great to meet you. What would you like to know?"},
+            ]
+        )
+        response = chat.send_message("I have 2 dogs in my house.", stream=True)
+        for chunk in response:
+            print(chunk.text)
+            print("_" * 80)
+        response = chat.send_message("How many paws are in my house?", stream=True)
+        for chunk in response:
+            print(chunk.text)
+            print("_" * 80)
+
+        print(chat.history)
+        # [END chat_streaming]
+
+    def test_chat_streaming_with_images(self):
+        # [START chat_streaming_with_images]
+        model = genai.GenerativeModel("gemini-1.5-flash")
+        chat = model.start_chat()
+
+        response = chat.send_message("Hello, I'm interested in learning about musical instruments. Can I show you one?", stream=True)
+        for chunk in response:
+            print(chunk.text)  # Yes.
+            print("_" * 80)
+        
+        organ = genai.upload_file(media / "organ.jpg")
+        response = chat.send_message(
+            ["What family of intruments does this instrument belong to?", organ], stream=True
+        )
+        for chunk in response:
+            print(chunk.text)
+            print("_" * 80)
+        # [END chat_streaming_with_images]
+
+
+if __name__ == "__main__":
+    absltest.main()