Add example for chat with history

[bibhas2]

Chat with history is perhaps the most common use case. In fact ollama run works like that. An example with that use case will be great for the newcomers. Here's a sample code:

import ollama

messages = []

def send(chat):
  messages.append(
    {
      'role': 'user',
      'content': chat,
    }
  )
  stream = ollama.chat(model='mistral:instruct', 
    messages=messages,
    stream=True,
  )

  response = ""
  for chunk in stream:
    part = chunk['message']['content']
    print(part, end='', flush=True)
    response = response + part

  messages.append(
    {
      'role': 'assistant',
      'content': response,
    }
  )

  print("")

while True:
    chat = input(">>> ")

    if chat == "/exit":
        break
    elif len(chat) > 0:
        send(chat)

[connor-makowski]

Related to:

https://github.com/ollama/ollama-python/issues/63

And:

https://github.com/ollama/ollama-python/pull/64

[u1i]

Examples are always great! How about adding: system prompt & temperature setting?