Mercurial > cpython-lru_cache-weakref

annotate Lib/lib-tk/tkFont.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents b53604fad54b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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6a018d8c59c9 r903@spiff: Fredrik | 2005-11-12 16:28:37 +0100
Fredrik Lundh <fredrik@pythonware.com>
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1 # Tkinter font wrapper
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2 #
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6a018d8c59c9 r903@spiff: Fredrik | 2005-11-12 16:28:37 +0100
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3 # written by Fredrik Lundh, February 1998
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4 #
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5 # FIXME: should add 'displayof' option where relevant (actual, families,
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6 # measure, and metrics)
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7 #
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8
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9 __version__ = "0.9"
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10
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11 import Tkinter
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12
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13 # weight/slant
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14 NORMAL = "normal"
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15 ROMAN = "roman"
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16 BOLD = "bold"
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17 ITALIC = "italic"
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18
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19 def nametofont(name):
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20 """Given the name of a tk named font, returns a Font representation.
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21 """
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22 return Font(name=name, exists=True)
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23
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24 class Font:
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25
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26 """Represents a named font.
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27
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28 Constructor options are:
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29
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30 font -- font specifier (name, system font, or (family, size, style)-tuple)
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31 name -- name to use for this font configuration (defaults to a unique name)
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32 exists -- does a named font by this name already exist?
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33 Creates a new named font if False, points to the existing font if True.
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34 Raises _Tkinter.TclError if the assertion is false.
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35
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36 the following are ignored if font is specified:
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37
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38 family -- font 'family', e.g. Courier, Times, Helvetica
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39 size -- font size in points
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40 weight -- font thickness: NORMAL, BOLD
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41 slant -- font slant: ROMAN, ITALIC
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42 underline -- font underlining: false (0), true (1)
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43 overstrike -- font strikeout: false (0), true (1)
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44
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45 """
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46
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47 def _set(self, kw):
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48 options = []
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49 for k, v in kw.items():
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50 options.append("-"+k)
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51 options.append(str(v))
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52 return tuple(options)
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53
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54 def _get(self, args):
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55 options = []
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56 for k in args:
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57 options.append("-"+k)
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58 return tuple(options)
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59
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60 def _mkdict(self, args):
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61 options = {}
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62 for i in range(0, len(args), 2):
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63 options[args[i][1:]] = args[i+1]
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64 return options
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65
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66 def __init__(self, root=None, font=None, name=None, exists=False, **options):
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67 if not root:
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68 root = Tkinter._default_root
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69 if font:
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70 # get actual settings corresponding to the given font
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71 font = root.tk.splitlist(root.tk.call("font", "actual", font))
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72 else:
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73 font = self._set(options)
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74 if not name:
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75 name = "font" + str(id(self))
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76 self.name = name
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77
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78 if exists:
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79 self.delete_font = False
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80 # confirm font exists
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81 if self.name not in root.tk.call("font", "names"):
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82 raise Tkinter._tkinter.TclError, "named font %s does not already exist" % (self.name,)
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83 # if font config info supplied, apply it
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84 if font:
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85 root.tk.call("font", "configure", self.name, *font)
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86 else:
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87 # create new font (raises TclError if the font exists)
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88 root.tk.call("font", "create", self.name, *font)
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89 self.delete_font = True
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90 # backlinks!
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91 self._root = root
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92 self._split = root.tk.splitlist
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93 self._call = root.tk.call
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94
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95 def __str__(self):
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96 return self.name
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97
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98 def __eq__(self, other):
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99 return self.name == other.name and isinstance(other, Font)
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100
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101 def __getitem__(self, key):
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102 return self.cget(key)
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103
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104 def __setitem__(self, key, value):
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105 self.configure(**{key: value})
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106
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107 def __del__(self):
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108 try:
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109 if self.delete_font:
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110 self._call("font", "delete", self.name)
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111 except (KeyboardInterrupt, SystemExit):
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112 raise
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113 except Exception:
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114 pass
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115
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116 def copy(self):
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117 "Return a distinct copy of the current font"
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118 return Font(self._root, **self.actual())
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119
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120 def actual(self, option=None):
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121 "Return actual font attributes"
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122 if option:
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123 return self._call("font", "actual", self.name, "-"+option)
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124 else:
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125 return self._mkdict(
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126 self._split(self._call("font", "actual", self.name))
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127 )
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128
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129 def cget(self, option):
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130 "Get font attribute"
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131 return self._call("font", "config", self.name, "-"+option)
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132
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133 def config(self, **options):
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134 "Modify font attributes"
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135 if options:
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136 self._call("font", "config", self.name,
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137 *self._set(options))
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138 else:
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139 return self._mkdict(
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140 self._split(self._call("font", "config", self.name))
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141 )
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142
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143 configure = config
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144
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145 def measure(self, text):
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146 "Return text width"
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147 return int(self._call("font", "measure", self.name, text))
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148
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149 def metrics(self, *options):
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150 """Return font metrics.
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151
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152 For best performance, create a dummy widget
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153 using this font before calling this method."""
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154
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155 if options:
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156 return int(
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157 self._call("font", "metrics", self.name, self._get(options))
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158 )
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159 else:
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160 res = self._split(self._call("font", "metrics", self.name))
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161 options = {}
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162 for i in range(0, len(res), 2):
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163 options[res[i][1:]] = int(res[i+1])
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164 return options
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165
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166 def families(root=None):
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167 "Get font families (as a tuple)"
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168 if not root:
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169 root = Tkinter._default_root
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170 return root.tk.splitlist(root.tk.call("font", "families"))
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171
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172 def names(root=None):
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173 "Get names of defined fonts (as a tuple)"
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174 if not root:
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175 root = Tkinter._default_root
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176 return root.tk.splitlist(root.tk.call("font", "names"))
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177
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178 # --------------------------------------------------------------------
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179 # test stuff
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180
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181 if __name__ == "__main__":
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182
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183 root = Tkinter.Tk()
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184
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185 # create a font
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186 f = Font(family="times", size=30, weight=NORMAL)
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187
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188 print f.actual()
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189 print f.actual("family")
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190 print f.actual("weight")
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191
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192 print f.config()
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193 print f.cget("family")
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194 print f.cget("weight")
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195
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196 print names()
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197
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198 print f.measure("hello"), f.metrics("linespace")
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199
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200 print f.metrics()
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201
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202 f = Font(font=("Courier", 20, "bold"))
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203 print f.measure("hello"), f.metrics("linespace")
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204
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205 w = Tkinter.Label(root, text="Hello, world", font=f)
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206 w.pack()
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207
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208 w = Tkinter.Button(root, text="Quit!", command=root.destroy)
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209 w.pack()
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210
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211 fb = Font(font=w["font"]).copy()
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212 fb.config(weight=BOLD)
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213
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214 w.config(font=fb)
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215
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216 Tkinter.mainloop()