# Troubleshooting

## January 24, 2022

Use pastebin from command line

Use pastebin from command line

Quite often, when you have a problem where, in order to get help you need to paste the contents of a file,or command output so that it can be shared, for example on IRC (Chat) or a forum, this can be challenging to begin with.

As it is depreciated that you paste more than 2 lines in to IRC chat. The way round this is to use a service called pastebin. Debian [1] has it's own service for this [2]. There is a tool called pastebinit which is really helpful from the command line.

The first step is to switch to the root user. Sear for and install the package pastebinit as per below.

Search

root@Desktop:/home/user# apt search pastebinit
Sorting... Done
Full Text Search... Done
pastebinit/stable 1.5.1-1 all
command-line pastebin client


Install

root@Desktop:/home/user# apt install pastebinit
Building dependency tree... Done
The following packages were automatically installed and are no longer required:
linux-image-5.10.0-7-amd64 linux-image-5.10.0-8-amd64
Use 'apt autoremove' to remove them.
The following NEW packages will be installed:
pastebinit
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 46.6 kB of archives.
After this operation, 342 kB of additional disk space will be used.
Get:1 http://deb.debian.org/debian bullseye/main amd64 pastebinit all 1.5.1-1 [46.6 kB]
Fetched 46.6 kB in 0s (342 kB/s)
Selecting previously unselected package pastebinit.
(Reading database ... 190310 files and directories currently installed.)
Preparing to unpack .../pastebinit_1.5.1-1_all.deb ...
Unpacking pastebinit (1.5.1-1) ...
Setting up pastebinit (1.5.1-1) ...
Processing triggers for man-db (2.9.4-2) ...
root@Desktop:/home/user#


Once complete switch back to normal user (usually type exit)

user@Desktop:~$cat /etc/apt/sources.list > pastebinit user@Desktop:~$ cat /etc/apt/sources.list | pastebinit
https://paste.debian.net/1228146/


In this example I have used the cat command and piped the contents in to pastebinit, this has given me a url to paste in to chat, (or copy manually)

Open this in a browser and you and others can see the contents, and people can help you further.

This is really useful too if you are stuck at the command prompt, without a graphical interface.

## December 7, 2020

LaTeX and Overleaf – Changing the compiler

A question came up on IRC earlier about Overleaf, LaTeX and compiling to use the \usepackage{arabluatex} package.

I suggested that it is possible to change the compiler to use LuaTeX and made the following video to help others with this

## May 21, 2020

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())

#insert value of variable add in	to box outtext

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_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.

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)

## May 20, 2020

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

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())

#instert value add in	to box outtext

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()



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)