"tkinter.font" --- Tkinter font wrapper
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**ソースコード:** Lib/tkinter/font.py

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"tkinter.font" モジュールは名前付きフォントを作成、使用するための
"Font" クラスを提供します。

The different font weights and slants are:

tkinter.font.NORMAL
tkinter.font.BOLD
tkinter.font.ITALIC
tkinter.font.ROMAN

class tkinter.font.Font(root=None, font=None, name=None, exists=False, **options)

   The "Font" class represents a named font. *Font* instances are
   given unique names and can be specified by their family, size, and
   style configuration. Named fonts are Tk's method of creating and
   identifying fonts as a single object, rather than specifying a font
   by its attributes with each occurrence.

      arguments:

            *font* - font specifier tuple (family, size, options)
            *name* - unique font name
            *exists* - self points to existing named font if true

      additional keyword options (ignored if *font* is specified):

            *family* - font family i.e. Courier, Times
            *size* - font size
               If *size* is positive it is interpreted as size in points.
               If *size* is a negative number its absolute value is treated
               as size in pixels.
            *weight* - font emphasis (NORMAL, BOLD)
            *slant* - ROMAN, ITALIC
            *underline* - font underlining (0 - none, 1 - underline)
            *overstrike* - font strikeout (0 - none, 1 - strikeout)

   actual(option=None, displayof=None)

      Return the attributes of the font.

   cget(option)

      Retrieve an attribute of the font.

   config(**options)

      Modify attributes of the font.

   copy()

      Return new instance of the current font.

   measure(text, displayof=None)

      Return amount of space the text would occupy on the specified
      display when formatted in the current font. If no display is
      specified then the main application window is assumed.

   metrics(*options, **kw)

      Return font-specific data. Options include:

      *ascent* - distance between baseline and highest point that a
         character of the font can occupy

      *descent* - distance between baseline and lowest point that a
         character of the font can occupy

      *linespace* - minimum vertical separation necessary between any
      two
         characters of the font that ensures no vertical overlap
         between lines.

      *fixed* - 1 if font is fixed-width else 0

tkinter.font.families(root=None, displayof=None)

   Return the different font families.

tkinter.font.names(root=None)

   Return the names of defined fonts.

tkinter.font.nametofont(name, root=None)

   Return a "Font" representation of a tk named font.

   バージョン 3.10 で変更: The *root* parameter was added.
