Function _source_unavailable

Lib/linecache.py:64–71

Return True if the source code is unavailable for such file name.

(filename)

def _source_unavailable(filename):
    """Return True if the source code is unavailable for such file name."""
    return (
        not filename
        or (filename.startswith('<')
            and filename.endswith('>')
            and not filename.startswith('<frozen '))
    )


def checkcache(filename=None):