mirror of
https://github.com/hwchase17/langchain
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92 lines
3.1 KiB
Python
92 lines
3.1 KiB
Python
from typing import List
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from langchain.prompts import PromptTemplate
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from langchain.prompts.chat import (
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AIMessagePromptTemplate,
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BaseMessagePromptTemplate,
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ChatMessagePromptTemplate,
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ChatPromptTemplate,
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ChatPromptValue,
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HumanMessagePromptTemplate,
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SystemMessagePromptTemplate,
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)
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def create_messages() -> List[BaseMessagePromptTemplate]:
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"""Create messages."""
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system_message_prompt = SystemMessagePromptTemplate(
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prompt=PromptTemplate(
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template="Here's some context: {context}",
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input_variables=["context"],
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)
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)
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human_message_prompt = HumanMessagePromptTemplate(
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prompt=PromptTemplate(
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template="Hello {foo}, I'm {bar}. Thanks for the {context}",
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input_variables=["foo", "bar", "context"],
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)
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)
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ai_message_prompt = AIMessagePromptTemplate(
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prompt=PromptTemplate(
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template="I'm an AI. I'm {foo}. I'm {bar}.",
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input_variables=["foo", "bar"],
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)
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)
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chat_message_prompt = ChatMessagePromptTemplate(
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role="test",
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prompt=PromptTemplate(
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template="I'm a generic message. I'm {foo}. I'm {bar}.",
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input_variables=["foo", "bar"],
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),
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)
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return [
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system_message_prompt,
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human_message_prompt,
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ai_message_prompt,
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chat_message_prompt,
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]
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def create_chat_prompt_template() -> ChatPromptTemplate:
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"""Create a chat prompt template."""
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return ChatPromptTemplate(
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input_variables=["foo", "bar", "context"],
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messages=create_messages(),
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)
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def test_chat_prompt_template() -> None:
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"""Test chat prompt template."""
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prompt_template = create_chat_prompt_template()
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prompt = prompt_template.format_prompt(foo="foo", bar="bar", context="context")
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assert isinstance(prompt, ChatPromptValue)
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messages = prompt.to_messages()
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assert len(messages) == 4
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assert messages[0].content == "Here's some context: context"
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assert messages[1].content == "Hello foo, I'm bar. Thanks for the context"
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assert messages[2].content == "I'm an AI. I'm foo. I'm bar."
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assert messages[3].content == "I'm a generic message. I'm foo. I'm bar."
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string = prompt.to_string()
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expected = (
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'[SystemMessage(content="Here\'s some context: context", '
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'additional_kwargs={}), HumanMessage(content="Hello foo, '
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"I'm bar. Thanks for the context\", additional_kwargs={}), "
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"AIMessage(content=\"I'm an AI. I'm foo. I'm bar.\", additional_kwargs={}), "
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"ChatMessage(content=\"I'm a generic message. I'm foo. I'm bar.\","
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" additional_kwargs={}, role='test')]"
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)
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assert string == expected
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string = prompt_template.format(foo="foo", bar="bar", context="context")
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assert string == expected
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def test_chat_prompt_template_from_messages() -> None:
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"""Test creating a chat prompt template from messages."""
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chat_prompt_template = ChatPromptTemplate.from_messages(create_messages())
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assert sorted(chat_prompt_template.input_variables) == sorted(
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["context", "foo", "bar"]
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)
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assert len(chat_prompt_template.messages) == 4
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