def is_valid_email(s):
    try:
        validate_email(s)
        return True
    except ValidationError:
        return False
If a signal handler is already installed,
dataset/ETHPy150Open lsaffre/lino/lino/core/utils.py/is_valid_email--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_twistd.py/UnixAppLoggerTestCase.test_getLogObserverDontOverrideSignalHandler