standard-library.rst

Standard Library

textwrap - 更多字串處理

>>> import textwrap

# 每行最多多少字（預設 70）
>>> textwrap.wrap('XD'*200)
['XDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD',
 'XDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD',
 'XDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD',
 'XDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD',
 'XDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD',
 'XDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD']

# '\n'.join(wrap(text, ...))
>>> textwrap.fill('XD'*200)
'XDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD\nXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD\nXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD\nXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD\nXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD\nXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXDXD'

# 縮減
>>> textwrap.shorten('XD '*200, width=12)
'XD XD [...]'
>>> textwrap.shorten('XD '*200, width=12, placeholder='口卡口卡～吃光光')
'XD口卡口卡～吃光光'

# 除去每行開頭多餘的空白
>>> s = '''
        我是 docstring!
            <- spaces QQ
        '''
>>> s
'\n    我是 docstring!\n        <- spaces QQ\n    '
>>> print(s)

    我是 docstring!
        <- spaces QQ

>>> textwrap.dedent(s)
'\n我是 docstring!\n    <- spaces QQ\n'
>>> print(textwrap.dedent(s))

我是 docstring!
    <- spaces QQ


# 每行加上 prefix
>>> s = '1\n2\n3\n4'
>>> textwrap.indent(s, '> ')
'> 1\n> 2\n> 3\n> 4'
>>> print(textwrap.indent(s, '> '))
> 1
> 2
> 3
> 4
>>> print(textwrap.indent(s, '> ', lambda x: x == '1\n'))
> 1
2
3
4

# textwrap 裡的 TextWrapper 還有許多屬性可以設定，
# 例如是否把 Tabs 展開成空白、是否可以把很長的字分開等等

unicodedata - Unicode Database 查詢

>>> import unicodedata

# 轉數值
>>> unicodedata.numeric('一')
1.0
>>> unicodedata.numeric('壹')
1.0
>>> unicodedata.numeric('玖')
9.0

# 查名稱
>>> unicodedata.name('》')
'RIGHT DOUBLE ANGLE BRACKET'

# 查字
>>> unicodedata.lookup('RIGHT DOUBLE ANGLE BRACKET')
'》'