Python.use(better) #Calculator: step02b -- class Calculator
‖記事一覧‖ Python.use(better)《Python3.1》《復刻版》
class Calculator
《著》森こねこ、小粒ちゃん＋∞《監修》小泉ひよ子とタマゴ倶楽部
第０版♪2001/03/02 ● 第１版♪2003/05/25 ● 第２版♪2004/06/01 ● 第３版♪2009/02/28
課題を作成する過程を通して「プログラミング」の理解を深めます。
※ Smalltalk-80 で作成した例題を、Python3.1 で再構成しました。
- Smalltalk a la carte #02, 電卓（デスクトップ）, 1988, 1992, 1995.
《移動中です》
class Calculator:
def __init__(self):
self.view = Plate()
self.op = ""
self.acc = 0
self.reset()
def __repr__(self): # ... same as last time
def __str__(self):
s = "".join(self.reg)
return s if s else "0"
## ----------------------------------------
def _changed(self): # ... same as last time
def _update(self):
self.view.display(str(self))
## ----------------------------------------
def reset(self): # ... same as last time
def clear(self):
self.reset()
self.acc = 0
self._changed()
def append(self, value): # ... same as last time
def eval(self): # ... same as last time
def __call__(self, key): # ... same as last time
## ----------------------------------------
class Plate:
def display(self, s):
print(s)
## ----------------------------------------
class Key: # ... same as last time
class NumKey(Key): # ... same as last time
class OpKey(Key): # ... same as last time
class ClrKey(Key):
def __call__(self):
return self.calculator.clear()
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