result = ""
for c in s:
    if ord(c) < 128:
        result += c
return result

If you only want the infilled part:
thon

from transformers import pipeline
import torch
generator = pipeline("text-generation",model="codellama/CodeLlama-7b-hf",torch_dtype=torch.float16, device_map="auto")
generator('def remove_non_ascii(s: str) -> str:\n    """ \n    return result', max_new_tokens = 128, return_type = 1)

Under the hood, the tokenizer automatically splits by <FILL_ME> to create a formatted input string that follows the original training pattern.