python中的嵌套类（内部类调用外部类中的方法函数）
在为书中版本是3.X的，但2.X不太支持直接调用。
所以，在PYTHON2.X中，要在内部类中调用外部类的方法，就必须得实例化外部类，然后，传入实例进行调用。
花了我两个小时啊，资料没找到，自己一个一个想法调试，真的失败了三四十次，PRINT了N多~~~：）
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class DiagramFactory:
@classmethod
def make_diagram(Class, width, height):
return Class.Diagram(width, height)
@classmethod
def make_rectangle(Class, x, y, width, height, fill = "white" ,
stroke = "black" ):
return Class.Rectangle(x, y, width, height, fill, stroke)
@classmethod
def make_text(Class, x, y, text, fontsize = 12 ):
return Class.Text(x, y, text, fontsize)
BLANK = " "
CORNER = "+"
HORIZONTAL = "-"
VERTICAL = "|"
class Diagram:
def __init__( self , width, height):
self .superclass = DiagramFactory()
self .width = width
self .height = height
self .diagram = DiagramFactory._create_rectangle( self .superclass, self .width, self .height, DiagramFactory.BLANK)
def add( self , component):
for y, row in enumerate (component.rows):
for x, char in enumerate (row):
self .diagram[y + component.y][x + component.x] = char
def save( self , filenameOrFile):
file = ( None if isinstance (filenameOrFile, str ) else
filenameOrFile)
try :
if file is None :
file = open (filenameOrFile, "w" )
for row in self .diagram:
print >> file , "".join(row)
finally :
if isinstance (filenameOrFile, str ) and file is not None :
file .close()
class Rectangle:
def __init__( self , x, y, width, height, fill, stroke):
self .superclass = DiagramFactory()
self .x = x
self .y = y
self .rows = DiagramFactory._create_rectangle( self .superclass, width, height,
DiagramFactory.BLANK if fill = = "white" else "%" )
class Text:
def __init__( self , x, y, text, fontsize):
self .x = x
self .y = y
self .rows = [ list (text)]
def _create_rectangle( self , width, height, fill):
rows = [[fill for _ in range (width)] for _ in range (height)]
for x in range ( 1 , width - 1 ):
rows[ 0 ][x] = DiagramFactory.HORIZONTAL
rows[height - 1 ][x] = DiagramFactory.HORIZONTAL
for y in range ( 1 , height - 1 ):
rows[y][ 0 ] = DiagramFactory.VERTICAL
rows[y][width - 1 ] = DiagramFactory.VERTICAL
for y, x in (( 0 , 0 ), ( 0 , width - 1 ), (height - 1 , 0 ),
(height - 1 , width - 1 )):
rows[y][x] = DiagramFactory.CORNER
return rows
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关键代码如下：
self.superclass = DiagramFactory()
self.width = width
self.height = height
self.diagram = DiagramFactory._create_rectangle(self.superclass,self.width, self.height, DiagramFactory.BLANK)
。。。。
def _create_rectangle(self, width, height, fill):
。。。。。
