print('''n = 123 f = 456.789 s1 = 'Hello, world' s2 = 'Hello,\\'Adam'' s3 = r'Hello,"Bart"' s4 = r'\'\'Hello, Lisa!\'\'\'''')
/r 是回车符号 r'无意义
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凝神目视阿萨德
print('''n = 123 f = 456.789 s1 = 'Hello, world' s2 = 'Hello,\\'Adam'' s3 = r'Hello,"Bart"' s4 = r'\'\'Hello, Lisa!\'\'\'''')