import re


def fixture_readme_code_snippet(readme_content: str) -> str:
    """Get the README.md example code snippet content.

    :param readme_content: plain text content of README.md
    :return: example code snippet
    """
    match = re.search(r"```python3([^`]*)```", readme_content, flags=re.DOTALL)
    assert match
    return match.group(1).lstrip()