Create perplexity.py

perplexity.py

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+from llama_index.llms.perplexity import Perplexity
+from llama_index.core.llms import ChatMessage
+
+def get_response_from_perplexity(question: str,  perplexity_key):
+
+    # Initialize Perplexity LLM
+    perplexity_llm = Perplexity(
+        api_key=perplexity_key,
+        model="sonar",
+        temperature=0.2
+    )
+    messages_dict = [
+        {"role": "system", "content": "answer in 2-3 sentences"},
+        {"role": "user", "content": question},
+    ]
+    messages = [ChatMessage(**msg) for msg in messages_dict]
+    response = perplexity_llm.chat(messages)
+    return response
+
+
+
+