foo.py

# to_unicode {{{1
def to_unicode(line: AnyStr) -> str:
    """Avoid ``b'line'`` type messages in the logs.

    Args:
        line (str): The bytecode or unicode string.

    Returns:
        str: the unicode-decoded string, if ``line`` was a bytecode string.
            Otherwise return ``line`` unmodified.

    """
    try:
        line = line.decode("utf-8")
    except (UnicodeDecodeError, AttributeError):
        pass
    return line

log.txt

src/scriptworker/utils.py:127: error: "str" has no attribute "decode"; maybe "encode"?
src/scriptworker/utils.py:127: error: Incompatible types in assignment (expression has type "str", variable has type "bytes")
src/scriptworker/utils.py:130: error: Incompatible return value type (got "bytes", expected "str")
src/scriptworker/log.py:81: error: Incompatible types in assignment (expression has type "str", variable has type "bytes")