【Python】07、python内置数据结构之字符串
In : s = "I love python"In : s.upper()
Out: 'I LOVE PYTHON'
In : s.lower()
Out: 'i love python'
In : s.title() # 首字母全部大写
Out: 'I Love Python'
In : s.capitalize() # 把首字母大写
Out: 'I love python'
In : print(s.center.__doc__) # 在给定宽度下居中，可以使用单个字符填充
S.center(width[, fillchar]) -> str
Return S centered in a string of length width. Padding is
done using the specified fill character (default is a space)
In : s.center(50)
Out: ' I love python '
In : s.center(50, "#")
Out: '##################I love python###################'
In : s.center(50, "#%")
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-13-4aa39ce1c3b3> in <module>()
----> 1 s.center(50, "#%")
TypeError: The fill character must be exactly one character long
In : s
Out: 'I love python'
In : s.zfill(5)
Out: 'I love python'
In : s.zfill(50) # 用0填充
Out: '0000000000000000000000000000000000000I love python'
In : print(s.casefold.__doc__)
S.casefold() -> str
Return a version of S suitable for caseless comparisons.
In : s
Out: 'I love python'
In : s.casefold() # 返回一个统一大小写的str，在不同平台有不同的表现形式
Out: 'i love python'
In : s.swapcase() # 交换大小写
Out: 'i LOVE PYTHON'
In : "\t".expandtabs()# 默认将\t转换为8个空格
Out: ' '
In : "\t".expandtabs(8)
Out: ' '
In : "\t".expandtabs(3)
Out: ' '
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