Function _has_surrogates

Lib/email/utils.py:47–56

Return True if s may contain surrogate-escaped binary data.

(s)

def _has_surrogates(s):
    """Return True if s may contain surrogate-escaped binary data."""
    # This check is based on the fact that unless there are surrogates, utf8
    # (Python's default encoding) can encode any string.  This is the fastest
    # way to check for surrogates, see bpo-11454 (moved to gh-55663) for timings.
    try:
        s.encode()
        return False
    except UnicodeEncodeError:
        return True

# How to deal with a string containing bytes before handing it to the
# application through the 'normal' interface.