Python3 Tkinter Text Widget INSERT on same line

Question

I have a tkinter app in python3 with a Text widget that I insert text into. I would like to append inserted text on the same line as the previous insert, like so:

from tkinter import *

class App :

    def __init__(self):
        sys.stdout.write = self.print_redirect

        self.root = Tk()
        self.root.geometry("900x600")

        self.mainframe = Text(self.root, bg='black', fg='white')
        self.mainframe.grid(column=0, row=0, sticky=(N,W,E,S)) 
        # Set the frame background, font color, and size of the text window
        self.mainframe.grid(column=0, row=0, sticky=(N,W,E,S))

        print( 'Hello: ' )

        print( 'World!' )

    def print_redirect(self, inputStr):
        # add the text to the window widget
        self.mainframe.insert(END, inputStr, None)
        # automtically scroll to the end of the mainframe window
        self.mainframe.see(END)


a = App()
a.root.mainloop()

I would like the resulting insert in the mainframe text widget to look like Hello: World! I'm having a hard time keeping the inserted text on the same line however. Everytime I insert, a new line is generated.

How can I keep the mainframe.insert input string on the same line without a line break?

Try inserting at a location of "end-1c", rather than END. — jasonharper
– jasonharper, Commented Jan 27, 2017 at 1:58
this code can't run. Please post actual, working code. If you edited the code so that it would actually run, it would indeed result in a text widget that had "Hello: World!", just like you want. — Bryan Oakley
– Bryan Oakley, Commented Jan 27, 2017 at 2:17
@jasonharper: that is not necessary. "end" or END is perfectly acceptable in this case. — Bryan Oakley
– Bryan Oakley, Commented Jan 27, 2017 at 2:20
@BryanOakley you're right, sorry. I was just trying to post the relevant code, but I left out necessary items. I fixed the OP and it correctly illustrates the problem now. (Maybe you could change your downvote now wink wink) — sadmicrowave
– sadmicrowave, Commented Jan 27, 2017 at 2:43
problem is not insert() but print() which always add '\n' at the end - but it is natural. You can use end="" to print text without '\n' - try print( 'Hello: ', end='' ). Or use inputStr.strip('\n') before you insert() text. — furas
– furas, Commented Jan 27, 2017 at 2:45

furas · Accepted Answer · 2017-01-27 02:56:19Z

5

Problem is not insert() but print() which always add '\n' at the end - but it is natural.

You can use end="" to print text without '\n'

print( 'Hello: ', end='' )

or directly

sys.stdout.write( 'Hello: ' )

Or in insert() use

inputStr.strip('\n')

But it will remove all '\n' - even if you will need '\n' ie.

print( 'Hello:\n\n\n' )

You will never know if you have to remove last '\n' or not.

edited Jan 27, 2017 at 2:56

answered Jan 27, 2017 at 2:49

furas

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2 Comments

sadmicrowave Over a year ago

This is exactly what I needed! I've already tested it an it solves my problem. Thanks for working through it with me.

furas Over a year ago

BTW: you can also use sys.stdout.write() instead of print() and then you don't have problem with '\n' and with spaces which ar added by print when you use comma.

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