A calculator，calculator,from Tkinter

A calculator，calculator,from Tkinter

from Tkinter   import *import Pmw, stringclass 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()