add standard libraries

the download link for these librarires will be mentioned in the README file

stdlibrary/color.py

@@ -0,0 +1,111 @@
+"""
+color.py
+
+The color module defines the Color class and some popular Color
+objects.
+"""
+
+#-----------------------------------------------------------------------
+
+class Color:
+    """
+    A Color object models an RGB color.
+    """
+
+    #-------------------------------------------------------------------
+
+    def __init__(self, r=0, g=0, b=0):
+        """
+        Construct self such that it has the given red (r),
+        green (g), and blue (b) components.
+        """
+        self._r = r  # Red component
+        self._g = g  # Green component
+        self._b = b  # Blue component
+
+    #-------------------------------------------------------------------
+
+    def getRed(self):
+        """
+        Return the red component of self.
+        """
+        return self._r
+
+    #-------------------------------------------------------------------
+
+    def getGreen(self):
+        """
+        Return the green component of self.
+        """
+        return self._g
+
+    #-------------------------------------------------------------------
+
+    def getBlue(self):
+        """
+        Return the blue component of self.
+        """
+        return self._b
+
+    #-------------------------------------------------------------------
+
+
+    def __str__(self):
+        """
+        Return the string equivalent of self, that is, a
+        string of the form '(r, g, b)'.
+        """
+        #return '#%02x%02x%02x' % (self._r, self._g, self._b)
+        return '(' + str(self._r) + ', ' + str(self._g) + ', ' + \
+            str(self._b) + ')'
+
+#-----------------------------------------------------------------------
+
+# Some predefined Color objects:
+
+WHITE      = Color(255, 255, 255)
+BLACK      = Color(  0,   0,   0)
+
+RED        = Color(255,   0,   0)
+GREEN      = Color(  0, 255,   0)
+BLUE       = Color(  0,   0, 255)
+
+CYAN       = Color(  0, 255, 255)
+MAGENTA    = Color(255,   0, 255)
+YELLOW     = Color(255, 255,   0)
+
+DARK_RED   = Color(128,   0,   0)
+DARK_GREEN = Color(  0, 128,   0)
+DARK_BLUE  = Color(  0,   0, 128)
+
+GRAY       = Color(128, 128, 128)
+DARK_GRAY  = Color( 64,  64,  64)
+LIGHT_GRAY = Color(192, 192, 192)
+
+ORANGE     = Color(255, 200,   0)
+VIOLET     = Color(238, 130, 238)
+PINK       = Color(255, 175, 175)
+
+# Shade of blue used in Introduction to Programming in Java.
+# It is Pantone 300U. The RGB values are approximately (9, 90, 166).
+BOOK_BLUE  = Color(  9,  90, 166)
+BOOK_LIGHT_BLUE = Color(103, 198, 243)
+
+# Shade of red used in Algorithms 4th edition
+BOOK_RED   = Color(150,  35,  31)
+
+#-----------------------------------------------------------------------
+
+def _main():
+    """
+    For testing:
+    """
+    from stdlibrary import stdio
+    c1 = Color(128, 128, 128)
+    stdio.writeln(c1)
+    stdio.writeln(c1.getRed())
+    stdio.writeln(c1.getGreen())
+    stdio.writeln(c1.getBlue())
+
+if __name__ == '__main__':
+    _main()