字符串Ⅰ
>>> x = "12321">>> "是回文数。" if x == x[::-1] else "不是回文数"
'是回文数。'
>>> # 大小写字母转换
>>> x = " I love FishC"
>>> x.capitalize()
' i love fishc'
>>> x.casefold()
' i love fishc'
>>> x.title()
' I Love Fishc'
>>> x.swapcase()
' i LOVE fISHc'
>>> x.upper()
' I LOVE FISHC'
>>> x.lower()
' i love fishc'
>>> # 左中右对齐
>>> x = "有内鬼，停止交易！"
>>> x.center(15)
' 有内鬼，停止交易！ '
>>> x.ljust(15)
'有内鬼，停止交易！ '
>>> x.rjust(15)
' 有内鬼，停止交易！'
>>> x.zfill(15)
'000000有内鬼，停止交易！'
>>> "520".zfill(5)
'00520'
>>> "-520".zfill(5)
'-0520'
>>> x.center(15, "淦")
'淦淦淦有内鬼，停止交易！淦淦淦'
>>> x.ljust(15, "淦")
'有内鬼，停止交易！淦淦淦淦淦淦'
>>> x.rjust(15, "淦")
'淦淦淦淦淦淦有内鬼，停止交易！'
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