from pathlib import Path


def check_source(source: str) -> bool:
    """
    Check whether a source file exists.

    Parameters
    ----------
    source: str
        Complete directory and file address as a string.

    Returns
    -------
    bool
    """
    if Path(source).exists():
        return True
    else:
        e = F"Source at `{source}` not found."
        raise FileNotFoundError(e)