Updating a label from an entry field on button push with tkinter in Python 3.5.2 -


i trying create window line label, entry field, current value label, , "update value" button.

here example:

enter image description here

this have far. can entered value print console, can't seem work out how entered value , change currentvalue label reflect value pressing button:

from tkinter import* main=tk()  #stringvar currentvalue in r0c2 currentvalue = stringvar(main, "0")  #called setvalues button, looks content in entry box , updates "current" label def setvalues():         content = entry.get()         print(content)   #this kills program def exitprogram():         exit()  #title , window size main.title("title") main.geometry("350x200")  #descriptions on far left label(main, text="duration (min): ").grid(row=0, column=0)  #entry boxes values amidship entry=entry(main, width=10) entry.grid(row=0, column=1)  #displays value set to. currentvalue = label(textvariable=currentvalue) currentvalue.grid(row=0,column=2)  #takes inputted values , sets them in "current" column using def setvalues setvalues=button(text='set values',width=30,command=setvalues) setvalues.grid(row=9, column=0, columnspan=2)  #red button end program exitbutton=button(main, text='exit program',fg='white',bg='red',width=30, height=1,command=exitprogram) exitbutton.grid(row=20, column = 0, columnspan=2) main.mainloop()

there couple of problems code.

firstly, overwriting setvalues function setvalues button widget, , similarly, overwriting currentvalue stringvar currentvalue label.

to set stringvar, use .set method.

don't use plain exit in script, that's meant used in interactive interpreter session, proper exit function sys.exit. however, in tkinter program can call .destroy method of root window.

here's repaired version of code.

import tkinter tk main = tk.tk()  #stringvar currentvalue in r0c2 currentvalue = tk.stringvar(main, "0")  #called setvalues button, looks content in entry box , updates "current" label def setvalues():     content = entry.get()     print(content)     currentvalue.set(content)  #this kills program def exitprogram():     main.destroy()  #title , window size main.title("title") main.geometry("350x200")  #descriptions on far left tk.label(main, text="duration (min): ").grid(row=0, column=0)  #entry boxes values amidship entry = tk.entry(main, width=10) entry.grid(row=0, column=1)  #displays value set to. currentvaluelabel = tk.label(textvariable=currentvalue) currentvaluelabel.grid(row=0,column=2)  #takes inputted values , sets them in "current" column using def setvalues setvaluesbutton = tk.button(text='set values',width=30,command=setvalues) setvaluesbutton.grid(row=9, column=0, columnspan=2)  #red button end program exitbutton = tk.button(main, text='exit program',fg='white',bg='red',width=30, height=1,command=exitprogram) exitbutton.grid(row=20, column = 0, columnspan=2) main.mainloop()

btw, it's idea avoid "star" imports. doing from tkinter import * dumps 130 names namespace, unnecessary , creates possibility of name collisions, if star imports several modules. makes code less readable, since reader has remember names defined , ones came imported module(s).


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more