Tkinter event error

[TMS]

Only a few weeks of school left. This assignment and then a project to go (GASP).

I'm writing a spreadsheet. I am required to have each 'cell' do 2 things: Evaluate if it is an equation, or if its a string just print it. Also, it is supposed to print the cell number on a different event reuqest.

Right now, I'm trying to get it to evaluate an equation, and I'm real close. I'm getting errors in the onEvent() function. I know it has to do with a syntax issue and I'm hoping you can find it. Been looking at this since yesterday and I'm frustrated.

I'm trying lambda functions, and perhaps that is where the problem is, or its just something else that I've overlooked. Here is what I have:

from Tkinter import *
class spreadsheet(Frame):
	"""
	initialize columns and rows, default of 5
	"""
	def __init__(self, parent=None, numrow=5, numcol=5):
		Frame.__init__(self, parent)
		self.numrow = numrow
		self.numcol = numcol
		self.makeWidgets(numrow, numcol)
 
	def onEvent(self, event, cell):
		""" define events, evaluate and show cell
		"""
		if event.num == 1:
			print cell  # this should actually replace what is in the cell without losing original data
		if event.num == 3:
			obj = dict[cell]   #error here, says cell is unscriptable.
			data = obj.get()
			if data.startwith('='):
				eq = data.lstrip('=')
				print data, eq
				try:
					result = eval(eq)
					obj.delete(0, 'end')
					obj.insert(0, str(result))
				except:
					pass  #nothing should crash the spreadsheet
 
	def returnKey(event, cell):
		pass
	 
	def makeWidgets(self, numrow, numcol):
		"""
		define labels for rows and columns, use entry widget, assign events, create dictionary of
		cell:widget pair
		"""
		dict = {}
		w = 20
		h = 1
		rowLabel = ["", 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
		for row in range(numrow):
			for col in range(numcol):
				if col == 0:
					# label rows
					labels = Label(root, width = 3, text = rowLabel[row])
					labels.grid(row=row, column=col, padx = 2, pady = 2)
				elif row == 0:
					# label columns
					labels = Label(root, width=3, text = str(col-1))
					labels.grid(row=row, column=col, padx = 2, pady =2)
				else:
					# use entry widget
					entrys = Entry(root, width=w)
					entrys.grid(row=row, column=col)
					cell = "%s%s" %(rowLabel[col], row)
					dict[cell] = entrys
					# bind to left mouse click
					entrys.bind('<Button-1>', lambda e, cell=cell: self.onEvent(e, cell))
					# bind the object to a right mouse click
					entrys.bind('<Button-3>', lambda e, cell=cell: self.onEvent(e, cell))
					# bind the object to a return/enter press
					entrys.bind('<Return>', lambda e, cell=cell: self.returnKey(e, cell))
		# start curser in row a column 0
		dict['a1'].focus()
if __name__ == '__main__':
	import sys
	root = Tk()
	root.title('S P R E A D S H E E T')
	if len(sys.argv) != 3:
		spreadsheet(root).grid()
	else:
		rows, cols = eval(sys.argv[1]), eval(sys.argv[2])
		spreadsheet(root, rows, cols).grid()
	root.mainloop()

thank you ahead of time for your help. I look forward to learning this language AFTER the class is over, when I can go back to the stuff that I missed with the breakneck speeds we've been using since taking this class.

TMS

[bartonc]

Very nice job!!! Your trouble was with your use of dict. That dictionary needed to be an instance variable too.

from Tkinter import *
class spreadsheet(Frame):
    """
    initialize columns and rows, default of 5
    """
    def __init__(self, parent=None, numrow=5, numcol=5):
        Frame.__init__(self, parent)
        self.numrow = numrow
        self.numcol = numcol

        # Need to keep the entries dictionary in self
        self.entriesDict = {}    # an empty dictionary
        # Don't use the keyword "dict"; use somethingDict.

        self.makeWidgets(numrow, numcol)

    def onEvent(self, event, cell):
        """ define events, evaluate and show cell
        """
        if event.num == 1:
            print cell  # this should actually replace what is in the cell without losing original data
        if event.num == 3:
            obj = self.entriesDict[cell]   #error here, says cell is unscriptable.
            data = obj.get()
            if data.startswith('='):  # startswith() was startwith()
                eq = data.lstrip('=')
                print data, eq
                try:
                    result = eval(eq)
                    obj.delete(0, 'end')
                    obj.insert(0, str(result))
                except:
                    pass  #nothing should crash the spreadsheet

    def returnKey(self, event, cell):
        pass

    def makeWidgets(self, numrow, numcol):
        """
        define labels for rows and columns, use entry widget, assign events, create dictionary of
        cell:widget pair
        """
        dict = {}
        w = 20
        h = 1
        rowLabel = ["", 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
        for row in range(numrow):
            for col in range(numcol):
                if col == 0:
                    # label rows
                    labels = Label(root, width = 3, text = rowLabel[row])
                    labels.grid(row=row, column=col, padx = 2, pady = 2)
                elif row == 0:
                    # label columns
                    labels = Label(root, width=3, text = str(col-1))
                    labels.grid(row=row, column=col, padx = 2, pady =2)
                else:
                    # use entry widget
                    entrys = Entry(root, width=w)
                    entrys.grid(row=row, column=col)
                    cell = "%s%s" %(rowLabel[col], row)
                    self.entriesDict[cell] = entrys
                    # bind to left mouse click
                    entrys.bind('<Button-1>', lambda e, cell=cell: self.onEvent(e, cell))
                    # bind the object to a right mouse click
                    entrys.bind('<Button-3>', lambda e, cell=cell: self.onEvent(e, cell))
                    # bind the object to a return/enter press
                    entrys.bind('<Return>', lambda e, cell=cell: self.returnKey(e, cell))
        # start curser in row a column 0
        self.entriesDict['a1'].focus()
if __name__ == '__main__':
    import sys
    root = Tk()
    root.title('S P R E A D S H E E T')
    if len(sys.argv) != 3:
        spreadsheet(root).grid()
    else:
        rows, cols = eval(sys.argv[1]), eval(sys.argv[2])
        spreadsheet(root, rows, cols).grid()
    root.mainloop()

[TMS]

OF COURSE... thank you :) I should have caught that.

again... TYVM
tms

[bartonc]

OF COURSE... thank you :) I should have caught that.

again... TYVM
tms

You are welcome, very much. Any time!