Building command in a looping construct

[DennisT]

Hi,
I'm trying to build commands in a loop. However it isn't working. Here's what I have coded:

 for PtrI in range(1,16): PNGID = "self.ShowPNG"+str(PtrI) FID = BASEPATH+"/graphics/CD"+str(PtrI)+".png" FileID = '"'+FID+'"' #embed double quotes in file name string (also tried w/o quotes) eval('PNGID+" = Gtk.Button()"') #add Show png(false buttons) eval('"self.fixed.put("+PNGID+","+str(MAIN_WINDOW_WIDTH-120)+","+str(MAIN_WINDOW_HEIGHT-120)+")"') #set false Button location eval('"self.image = Gtk.Image.new_from_file("+FileID+")"') #set up to use a picture 4 button eval('PNGID+".set_image(self.image)"') #set image to button eval('PNGID+".set_relief(Gtk.ReliefStyle.NONE)"') #remove the button border 2 show only png eval('PNGID+".set_no_show_all(True)"') #display only when we specifically say to

To display I do:

ShowPtr = 8 eval('"self.ShowPNG"+str(self.ShowPtr)+".show()"')

Both the creation and the final show appear to work (no errors) yet I get nothing.

If I do a manual version such as the below it works:

 self.ShowPNG8 = Gtk.Button() #add ShowPNG8(false buttons) self.fixed.put(self.ShowPNG8,1160,680) #set false Button location self.image = Gtk.Image.new_from_file(BASEPATH+"/graphics/CD8.png") #set up to use a picture 4 button self.ShowPNG8.set_image(self.image) #set image to button self.ShowPNG8.set_relief(Gtk.ReliefStyle.NONE) #remove the button border 2 show only png self.ShowPNG8.set_no_show_all(True) #display only when we specifically say to self.ShowPNG8.show()

Perhaps eval isn't the correct expression to use?

[buran]

OMG, why do you do this? why evals? this is obvious XY problem, tell what you want to do

[bowlofred]

Create a data structure (a list or a dict) and assign your images to them. No eval needed and easy to loop over. Don't create a separate variable for each.

[DennisT]

Thanks. I was hung up on how to create the command string when it wasn't needed. I set up a list and that is working great.