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A calculator

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from Tkinter   import *
import Pmw, string

class SLabel(Frame):
    ''' SLabel defines a 2-sided label within a Frame. The
        left hand label has blue letters the right has white letters '''
    def __init__(self, master, leftl, rightl):
        Frame.__init__(self, master, bg='gray40')
        self.pack(side=LEFT, expand=YES, fill=BOTH)
        Label(self, text=leftl, fg='steelblue1',
                     font=('arial', 6, 'bold'), width=5, bg='gray40').pack(
                         side=LEFT, expand=YES, fill=BOTH)
        Label(self, text=rightl, fg='white',
                     font=('arial', 6, 'bold'), width=1, bg='gray40').pack(
                         side=RIGHT, expand=YES, fill=BOTH)

class Key(Button):
    def __init__(self, master, font=('arial', 8, 'bold'), 
                 fg='white',width=5, borderwidth=5, **kw):
        kw['font'] = font
        kw['fg'] = fg
        kw['width'] = width
        kw['borderwidth'] = borderwidth
        apply(Button.__init__, (self, master), kw)
        self.pack(side=LEFT, expand=NO, fill=NONE)

class Calculator(Frame):
    def __init__(self, parent=None):
        Frame.__init__(self, bg='gray40')
        self.pack(expand=YES, fill=BOTH)
        self.master.title('Tkinter Toolkit TT-42')
        self.master.iconname('Tk-42')
        self.calc = Evaluator()        # This is our evaluator
        self.buildCalculator()         # Build the widgets
        # This is an incomplete dictionary - a good exercise!
        self.actionDict = {'second': self.doThis, 'mode':    self.doThis,
                           'delete': self.doThis, 'alpha':   self.doThis,
                           'stat':   self.doThis, 'math':    self.doThis,
                           'matrix': self.doThis, 'program': self.doThis,
                           'vars':   self.doThis, 'clear':   self.clearall,
                           'sin':    self.doThis, 'cos':     self.doThis,
                           'tan':    self.doThis, 'up':      self.doThis,
                           'X1':     self.doThis, 'X2':      self.doThis,
                           'log':    self.doThis, 'ln':      self.doThis,
                           'store':  self.doThis, 'off':     self.turnoff,
                           'neg':    self.doThis, 'enter':   self.doEnter,
                           }
        self.current = ''

    def doThis(self,action):
        print ''%s' has not been implemented' % action

    def turnoff(self, *args):
        self.quit()

    def clearall(self, *args):
        self.current = ''
        self.display.component('text').delete(1.0, END)

    def doEnter(self, *args):
        result = self.calc.runpython(self.current)
        if result:
            self.display.insert(END, '\n')
            self.display.insert(END, '%s\n' % result, 'ans')
        self.current = ''

    def doKeypress(self, event):
        key = event.char
        if not key in ['\b']:
            self.current = self.current + event.char
        if key == '\b':
            self.current = self.current[:-1]

    def keyAction(self, key):
        self.display.insert(END, key)
        self.current = self.current + key

    def evalAction(self, action):
  try:
            self.actionDict[action](action)
  except KeyError:
            pass

    def buildCalculator(self):
        FUN   = 1            # Designates a Function
        KEY   = 0            # Designates a Key
        KC1   = 'gray30'     # Dark Keys
        KC2   = 'gray50'     # Light Keys
        KC3   = 'steelblue1' # Light Blue Key
        KC4   = 'steelblue'  # Dark Blue Key
        keys = [
            [('2nd',  '',     '',  KC3, FUN, 'second'),  # Row 1
             ('Mode', 'Quit', '',  KC1, FUN, 'mode'),
             ('Del',  'Ins',  '',  KC1, FUN, 'delete'),
             ('Alpha','Lock', '',  KC2, FUN, 'alpha'),
             ('Stat', 'List', '',  KC1, FUN, 'stat')],
            [('Math', 'Test', 'A', KC1, FUN, 'math'),    # Row 2
             ('Mtrx', 'Angle','B', KC1, FUN, 'matrix'),
             ('Prgm', 'Draw', 'C', KC1, FUN, 'program'),
             ('Vars', 'YVars','',  KC1, FUN, 'vars'),
             ('Clr',  '',     '',  KC1, FUN, 'clear')],        
            [('X-1',  'Abs',  'D', KC1, FUN, 'X1'),      # Row 3
             ('Sin',  'Sin-1','E', KC1, FUN, 'sin'),
             ('Cos',  'Cos-1','F', KC1, FUN, 'cos'),
             ('Tan',  'Tan-1','G', KC1, FUN, 'tan'),
             ('^',    'PI',   'H', KC1, FUN, 'up')],
            [('X2',   'Root', 'I', KC1, FUN, 'X2'),      # Row 4
             (',',    'EE',   'J', KC1, KEY, ','),
             ('(',    '{',    'K', KC1, KEY, '('),
             (')',    '}',    'L', KC1, KEY, ')'),
             ('/',    '',     'M', KC4, KEY, '/')],
            [('Log',  '10x',  'N', KC1, FUN, 'log'),     # Row 5
             ('7',    'Un-1', 'O', KC2, KEY, '7'),
             ('8',    'Vn-1', 'P', KC2, KEY, '8'),
             ('9',    'n',    'Q', KC2, KEY, '9'),
             ('X',    '[',    'R', KC4, KEY, '*')],
            [('Ln',   'ex',   'S', KC1, FUN, 'ln'),      # Row 6
             ('4',    'L4',   'T', KC2, KEY, '4'),
             ('5',    'L5',   'U', KC2, KEY, '5'),
             ('6',    'L6',   'V', KC2, KEY, '6'),
             ('-',    ']',    'W', KC4, KEY, '-')],
            [('STO',  'RCL',  'X', KC1, FUN, 'store'),   # Row 7
             ('1',    'L1',   'Y', KC2, KEY, '1'),
             ('2',    'L2',   'Z', KC2, KEY, '2'),
             ('3',    'L3',   '',  KC2, KEY, '3'),
             ('+',    'MEM',  ''', KC4, KEY, '+')],
            [('Off',  '',     '',  KC1, FUN, 'off'),     # Row 8
             ('0',    '',     '',  KC2, KEY, '0'),
             ('.',    ':',    '',  KC2, KEY, '.'),
             ('(-)',  'ANS',  '?', KC2, FUN, 'neg'),
             ('Enter','Entry','',  KC4, FUN, 'enter')]]

        self.display = Pmw.ScrolledText(self, hscrollmode='dynamic',
                      vscrollmode='dynamic', hull_relief='sunken',
                      hull_background='gray40', hull_borderwidth=10, 
                      text_background='honeydew4', text_width=16,
                      text_foreground='black', text_height=6,
          text_padx=10, text_pady=10, text_relief='groove',
                      text_font=('arial', 12, 'bold'))
        self.display.pack(side=TOP, expand=YES, fill=BOTH)
        self.display.tag_config('ans', foreground='white')
        self.display.component('text').bind('<Key>', self.doKeypress)
        self.display.component('text').bind('<Return>', self.doEnter)

        for row in keys:
            rowa = Frame(self, bg='gray40')
            rowb = Frame(self, bg='gray40')
            for p1, p2, p3, color, ktype, func in row:
                if ktype == FUN:
                    a = lambda s=self, a=func: s.evalAction(a)
                else:
                    a = lambda s=self, k=func: s.keyAction(k)
                SLabel(rowa, p2, p3)
                Key(rowb, text=p1, bg=color, command=a)
            rowa.pack(side=TOP, expand=YES, fill=BOTH)
            rowb.pack(side=TOP, expand=YES, fill=BOTH)            

class Evaluator:
    def __init__(self):
        self.myNameSpace = {} 
        self.runpython('from math import *')

    def runpython(self, code):
        try:
            return 'eval(code, self.myNameSpace, self.myNameSpace)'
        except SyntaxError:
            try:
                exec code in self.myNameSpace, self.myNameSpace
            except:
                return 'Error'

Calculator().mainloop()

标签:Python,Application

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