alphanumeric_restriction("Bold") ➞ True

alphanumeric_restriction("123454321") ➞ True

alphanumeric_restriction("H3LL0") ➞ False

self.assertEqual(alphanumeric_restriction("Bold"), True)
self.assertEqual(alphanumeric_restriction("123454321"), True)
self.assertEqual(alphanumeric_restriction("H3LL0"), False)
self.assertEqual(alphanumeric_restriction("back@end"), False)
self.assertEqual(alphanumeric_restriction("0"), True)
self.assertEqual(alphanumeric_restriction("only letters right"), False)
self.assertEqual(alphanumeric_restriction("()"), False)
self.assertEqual(alphanumeric_restriction("132 143 234"), False)

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