import re
l = ['python','abc123','@@','!!','12345abc#','hello@','141351351','123abc']
print( ["" if not re.search(r'[^\W\d_]', x) else x for x in l] )
print( ["" if not any(c.isalpha() for c in x) else x for x in l] )
aW1wb3J0IHJlCmwgPSBbJ3B5dGhvbicsJ2FiYzEyMycsJ0BAJywnISEnLCcxMjM0NWFiYyMnLCdoZWxsb0AnLCcxNDEzNTEzNTEnLCcxMjNhYmMnXQpwcmludCggWyIiIGlmIG5vdCByZS5zZWFyY2gocidbXlxXXGRfXScsIHgpIGVsc2UgeCBmb3IgeCBpbiAgbF0gKQpwcmludCggWyIiIGlmIG5vdCBhbnkoYy5pc2FscGhhKCkgZm9yIGMgaW4geCkgZWxzZSB4IGZvciB4IGluICBsXSApCg==
['python', 'abc123', '', '', '12345abc#', 'hello@', '', '123abc']
['python', 'abc123', '', '', '12345abc#', 'hello@', '', '123abc']