```python
from langchain.output_parsers import CommaSeparatedListOutputParser
from langchain.prompts import PromptTemplate, ChatPromptTemplate, HumanMessagePromptTemplate
from langchain.llms import OpenAI
from langchain.chat_models import ChatOpenAI

output_parser = CommaSeparatedListOutputParser()
```


```python
format_instructions = output_parser.get_format_instructions()
prompt = PromptTemplate(
    template="List five {subject}.\n{format_instructions}",
    input_variables=["subject"],
    partial_variables={"format_instructions": format_instructions}
)
```


```python
model = OpenAI(temperature=0)
```


```python
_input = prompt.format(subject="ice cream flavors")
output = model(_input)
```


```python
output_parser.parse(output)
```

<CodeOutputBlock lang="python">

```
    ['Vanilla',
     'Chocolate',
     'Strawberry',
     'Mint Chocolate Chip',
     'Cookies and Cream']
```

</CodeOutputBlock>
