String = "abc123def456",那么String[3]的值是______,String[-3]的值是______.
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转义字符\102,代表哪个字符_______;转义字符\x62,代表哪个字符______.
a = "123", b = "456"，则a + b的值是______; a = 12, b = 54,则a + b的值是______.
a = 123, b = 2,则a*b的值是______;a = "123", b = 2,则a*b的值是______.
str1 = "abc",str2 = "aBcde,则str1 > str2的值是______；str1 = "你好，武汉", 则 "好" not in str1 的值是______.
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