author | Shabe Razvi <shaber@symbian.org> |
Wed, 21 Oct 2009 13:56:56 +0100 | |
changeset 17 | c506b18dc03f |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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Initial QEMU (symbian-qemu-0.9.1-12) import
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"""Enumeration metaclass. |
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XXX This is very much a work in progress. |
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""" |
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import string |
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class EnumMetaClass: |
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"""Metaclass for enumeration. |
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To define your own enumeration, do something like |
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|
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class Color(Enum): |
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red = 1 |
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green = 2 |
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blue = 3 |
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Now, Color.red, Color.green and Color.blue behave totally |
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different: they are enumerated values, not integers. |
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|
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Enumerations cannot be instantiated; however they can be |
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subclassed. |
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""" |
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def __init__(self, name, bases, dict): |
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"""Constructor -- create an enumeration. |
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|
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Called at the end of the class statement. The arguments are |
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the name of the new class, a tuple containing the base |
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classes, and a dictionary containing everything that was |
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entered in the class' namespace during execution of the class |
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statement. In the above example, it would be {'red': 1, |
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'green': 2, 'blue': 3}. |
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""" |
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for base in bases: |
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if base.__class__ is not EnumMetaClass: |
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raise TypeError, "Enumeration base class must be enumeration" |
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bases = filter(lambda x: x is not Enum, bases) |
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self.__name__ = name |
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self.__bases__ = bases |
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self.__dict = {} |
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for key, value in dict.items(): |
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self.__dict[key] = EnumInstance(name, key, value) |
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|
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def __getattr__(self, name): |
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"""Return an enumeration value. |
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50 |
|
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For example, Color.red returns the value corresponding to red. |
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52 |
|
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XXX Perhaps the values should be created in the constructor? |
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54 |
|
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This looks in the class dictionary and if it is not found |
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there asks the base classes. |
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57 |
|
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The special attribute __members__ returns the list of names |
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defined in this class (it does not merge in the names defined |
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in base classes). |
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61 |
|
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""" |
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if name == '__members__': |
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return self.__dict.keys() |
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|
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try: |
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return self.__dict[name] |
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except KeyError: |
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for base in self.__bases__: |
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try: |
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return getattr(base, name) |
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except AttributeError: |
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continue |
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74 |
|
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raise AttributeError, name |
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76 |
|
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def __repr__(self): |
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s = self.__name__ |
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if self.__bases__: |
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s = s + '(' + string.join(map(lambda x: x.__name__, |
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self.__bases__), ", ") + ')' |
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if self.__dict: |
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list = [] |
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for key, value in self.__dict.items(): |
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list.append("%s: %s" % (key, int(value))) |
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s = "%s: {%s}" % (s, string.join(list, ", ")) |
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return s |
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88 |
|
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89 |
|
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class EnumInstance: |
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"""Class to represent an enumeration value. |
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92 |
|
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EnumInstance('Color', 'red', 12) prints as 'Color.red' and behaves |
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like the integer 12 when compared, but doesn't support arithmetic. |
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95 |
|
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XXX Should it record the actual enumeration rather than just its |
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97 |
name? |
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98 |
|
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""" |
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100 |
|
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def __init__(self, classname, enumname, value): |
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self.__classname = classname |
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self.__enumname = enumname |
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self.__value = value |
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105 |
|
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106 |
def __int__(self): |
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return self.__value |
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108 |
|
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def __repr__(self): |
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return "EnumInstance(%r, %r, %r)" % (self.__classname, |
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self.__enumname, |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
112 |
self.__value) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
113 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
114 |
def __str__(self): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
115 |
return "%s.%s" % (self.__classname, self.__enumname) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
116 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
117 |
def __cmp__(self, other): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
118 |
return cmp(self.__value, int(other)) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
119 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
120 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
121 |
# Create the base class for enumerations. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
122 |
# It is an empty enumeration. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
123 |
Enum = EnumMetaClass("Enum", (), {}) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
124 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
125 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
126 |
def _test(): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
127 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
128 |
class Color(Enum): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
129 |
red = 1 |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
130 |
green = 2 |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
131 |
blue = 3 |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
132 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
133 |
print Color.red |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
134 |
print dir(Color) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
135 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
136 |
print Color.red == Color.red |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
137 |
print Color.red == Color.blue |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
138 |
print Color.red == 1 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
139 |
print Color.red == 2 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
140 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
141 |
class ExtendedColor(Color): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
142 |
white = 0 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
143 |
orange = 4 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
144 |
yellow = 5 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
145 |
purple = 6 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
146 |
black = 7 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
147 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
148 |
print ExtendedColor.orange |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
149 |
print ExtendedColor.red |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
150 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
151 |
print Color.red == ExtendedColor.red |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
152 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
153 |
class OtherColor(Enum): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
154 |
white = 4 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
155 |
blue = 5 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
156 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
157 |
class MergedColor(Color, OtherColor): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
158 |
pass |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
159 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
160 |
print MergedColor.red |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
161 |
print MergedColor.white |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
162 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
163 |
print Color |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
164 |
print ExtendedColor |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
165 |
print OtherColor |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
166 |
print MergedColor |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
167 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
168 |
if __name__ == '__main__': |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
169 |
_test() |