Add more functions

I have added a few more maths functions to the application and also provided a clear function. There are still a few items to add to help improve debugging but the application is starting to take shape.

Notes

window = Tk()
window.title('Maths Application')
window.geometry("570x150") # w x h
window.resizable(0,0)

1. The above code is being modified as I go. So I am changing the window size depending on what is being displayed.

2. I have also made the Window title reflect the purpose of the application.

3. That the source code now has 'result' as a label rather than output. This will show up future screenshots.

The code for the above is as follows.

#!/usr/bin/env python
import Tkinter # note use of caps
from Tkinter import *

window = Tk()
window.title('Maths Application')
window.geometry("570x150") # w x h
window.resizable(0,0)

#define button actions
def btn1():
	#convert box text in to integers	
	ent1 = int(entrytext.get())
	ent2 = int(entrytext2.get())
	
	#add the 2 integers and store in variable add
	add = (ent1 + ent2)
	print (add)
	
	#insert value of variable add in	to box outtext 
	outtext1.insert(0,str(add)) # insert response

def btn2():
	#print("subtraction")
	ent1 = int(entrytext.get())
	ent2 = int(entrytext2.get())
	
	#subtract the 2 integers and store in variable sub
	sub = (ent1 - ent2)
	
	
	#insert value of variable sub in	to box outtext 
	outtext1.insert(0,str(sub)) # insert response	
	
def btn3():
	#print("multiply")
	ent1 = int(entrytext.get())
	ent2 = int(entrytext2.get())
	
	#multiply the 2 integers and store in variable mul
	mul = (ent1 * ent2)
		
	#insert value of variable mul in	to box outtext 
	outtext1.insert(0,str(mul)) # insert response		

def btn4():
	#print("divide")
	ent1 = int(entrytext.get())
	ent2 = int(entrytext2.get())
	
	#multiply the 2 integers and store in variable div
	div = (ent1 / ent2)
		
	#insert value of variable mul in	to box outtext 
	outtext1.insert(0,str(div)) # insert response	
	
#clear boxes
def clear():
	#print("clear boxes") # leave in for legacy testing
	entrytext.delete(0, END) # clear input box
	entrytext2.delete(0, END) # clear input box2
	outtext1.delete(0, END) # clear output box
	
btn_tog2 = Button( window, text ='+', command=btn1) # add
btn_tog3 = Button( window, text ='-', command=btn2)  # subtract
btn_tog4 = Button( window, text ='x', command=btn3) #multiply
btn_tog5 = Button( window, text ='/', command=btn4) #divide
btn_tog6 = Button( window, text ='Clear', command=clear) #clear
btn_exit = Button( window, text ='Exit',command=exit)	 #exit

# define some labels
box1 = Label(window, text="1st Value")
box2 = Label(window, text="2nd Value")
box3 = Label(window, text="Result")

#define entry box 
entry1 = StringVar() # this is our entry box
entry2 = StringVar()
entrytext = Entry(window, textvariable=entry1) # this is our entry box
entrytext2 = Entry(window, textvariable=entry2) # this is our second entry box

#define out box 

entry2 = StringVar() # this is our output box
outtext1 = Entry(window, textvariable=entry2) # this is our output box

#display boxes
entrytext.grid(row = 3, column = 2,)  #display entry box
entrytext2.grid(row = 3, column = 3,)  #display entry box
outtext1.grid(row = 3, column = 4,) #display output box

#place labels
box1.grid(row = 1	, column = 2, padx = 5, pady = 5)
box2.grid(row = 1	, column = 3, padx = 5, pady = 5)
box3.grid(row = 1	, column = 4, padx = 5, pady = 5)

#buttons
btn_tog2.grid(row = 4, column = 2, padx = 1, pady = 1) # addition button
btn_tog3.grid(row = 4, column = 3, padx = 1, pady = 1) # subtraction button
btn_tog4.grid(row = 5, column = 2, padx = 1, pady = 1) # multiply button
btn_tog5.grid(row = 5, column = 3, padx = 1, pady = 1) # divide button
btn_tog6.grid(row = 4, column = 6, padx = 1, pady = 1) # clear button
btn_exit.grid(row = 3, column = 6, padx = 1, pady = 1) # exit button

window.mainloop()

The code that I used for a previous application to detect if numerical values have been used is below but provided 'as is' for now.

def response():
		
	msg = "error : must be a text value"

	i = circletext.get()
	y = i.isdigit()
	l = len(circletext.get())
	#print l
	if y == True or l == 0:
		circletext.insert(0,(msg))
		
	else:	
		x = random.choice(RESPONSES)
		circletext2.delete(0, END) # clear prev output
		circletext2.insert(0,str(x)) # insert response

I will integrate a version of this in to the main code.

#python, #tkinter, #programming, #python, #graphic, #applications, #bugs, #troubleshooting, #howto, #paignton, #library, #virtual, #codeclub

Happy to provide help and support via decentralised social media. I can be contacted on Mastodon here. You can get a free account on the http://qoto.org instance by following this link.

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Addition Application

So following on from the previous posts, I am how sharing a small application, that makes use of what we have been learning.

This presents 2 input boxes and an output box, any values entered in to the first two, the sum is placed in to the last box.

This is not perfect, but getting there slowly.

We need to:-

• Fix the name of the button from button1
• Detect if the user has entered numerical values
• Detect for empty boxes
• Make labels more useful
• Fix spelling in comments
• Fix clarity of comments

The code for the above is as follows.

#!/usr/bin/env python
import Tkinter # note use of caps
from Tkinter import *

window = Tk()
window.title('App 1')
window.geometry("650x125") # w x h
window.resizable(0,0)

#define button actions
def btn1():
	#convert box text in to integers	
	ent1 = int(entrytext.get())
	ent2 = int(entrytext2.get())
	
	#add the 2 integers and store in variable add
	add = (ent1 + ent2)
	print add
	
	#instert value add in	to box outtext 
	outtext1.insert(0,str(add)) # insert response
	
btn_tog2 = Button( window, text ='button1', command=btn1)
btn_exit = Button( window, text ='exit',command=exit)	

# define some labels
box1 = Label(window, text="Entry 1: ")
box2 = Label(window, text="Entry 2: ")
box3 = Label(window, text="Ouput1: ")

#define entry box 
entry1 = StringVar() # this is our entry box
entry2 = StringVar()
entrytext = Entry(window, textvariable=entry1) # this is our entry box
entrytext2 = Entry(window, textvariable=entry2) # this is our second entry box

#define out box 

entry2 = StringVar() # this is our output box
outtext1 = Entry(window, textvariable=entry2) # this is our output box

#display boxes
entrytext.grid(row = 3, column = 2,)  #display entry box
entrytext2.grid(row = 3, column = 3,)  #display entry box
outtext1.grid(row = 3, column = 4,) #display output box

#place labels
box1.grid(row = 1	, column = 2, padx = 5, pady = 5)
box2.grid(row = 1	, column = 3, padx = 5, pady = 5)
box3.grid(row = 1	, column = 4, padx = 5, pady = 5)

#buttons
btn_tog2.grid(row = 3, column = 5, padx = 5, pady = 5)
btn_exit.grid(row = 3, column = 6, padx = 5, pady = 5)

window.mainloop()

#python, #tkinter, #programming, #python, #graphic, #applications, #bugs, #troubleshooting, #howto, #paignton, #library, #virtual, #codeclub

Happy to provide help and support via decentralised social media. I can be contacted on Mastodon here. You can get a free account on the http://qoto.org instance by following this link.

Licenced under Attribution 4.0 International (CC BY 4.0)

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At Paignton virtual Code Club, we are now approaching the end of the Scratch modules. Well done to everyone. The next step is probably to progress to Python [2][3].

If you don't feel ready to do lots of typing, you may want to look at Trinket and blocks. Then perhaps move to the Code Club modules [3].

Blocks, as the name suggests, is a block based system. The difference here is, that the blocks are all Python statements and code. So combining these allow you to easily start coding in Python.

To get started you need to sign up for an account on the Trinket website [1]

Click you user name and select new trinket and then select blocks

You are now presented with your development area.

You may want to change your project title to something meaningful.

You can select the category of block, then simply use click / drag in similar way as you would with Scratch.

So in this example I am just going to draw a square.

As we are using turtle, you will need to change the pen up, block so that it says pen down.

Adding comments to your code is important, as it helps you keep track of what the code is doing and helps with debugging also helps others understand your code.

You can also view the Python code that is produced, this can be copy / pasted to IDE so you can just run the Python code on its own.

![View Python]

https://raw.githubusercontent.com/zleap/blogmedia/master/trinket/square-python-code.png

Finally you can share your project with others.

Hopefully this is helpful.

Resources

1 Trinket 2 Python 3 Code Club python Modules

#codeclub,#paignton,#trinket,#python,#coding,#skills,#technology

Licenced under Attribution 4.0 International (CC BY 4.0)

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