python - TypeError: Can't convert 'DoubleVar' object to str implicitly -

i creating simple gui program measure time event. getting error:

/usr/bin/python3.5 /home/cali/pycharmprojects/str8/str8.py traceback (most recent call last): file "/home/cali/pycharmprojects/str8/str8.py", line 51, in app = app(root) file "/home/cali/pycharmprojects/str8/str8.py", line 22, in init label(self, text=measurement + ": " + self.counters[measurement], font='verdana 8').grid(row=i+1, column=0, sticky=w) typeerror: can't convert 'doublevar' object str implicitly

process finished exit code 1

i have tried this:

label(self, text=measurement + ": " + str(self.counters[measurement]), font='verdana 8').grid(row=i+1, column=0, sticky=w) 

...but gives me this:

gui program

here have done:

# str8.py #   program count time event  tkinter import * datetime import *   class app(frame):      def __init__(self, *args, **kwargs):          frame.__init__(self, *args, **kwargs)         self.grid(sticky = n + w + e + s)          label(self, text = 'you have been str8 for:', font="verdana 8 bold").grid(row=0, sticky=w)          self.counters = dict()         measurements = [ 'years', 'weeks', 'days', 'hours', 'minutes', 'seconds' ]          i, measurement in enumerate(measurements):             self.counters[measurement] = doublevar()             label(self, text=measurement + ": " + self.counters[measurement], font='verdana 8').grid(row=i+1, column=0, sticky=w)             self.counters[measurement].set(0)          button(self,                text="exit",                font="verdana 8",                height=1,                width=19,                command=quit).grid(row=7, column=0)          self.increment()      def increment(self):         event = datetime(2017, 4, 4, 0, 0, 0)         today = datetime.now()          str8 = today - event         self.counters['seconds'].set(round(str8.total_seconds(), 2))         self.counters['minutes'].set(round(str8.total_seconds()/ 60, 2))         self.counters['hours'].set(round(str8.total_seconds() / 3600, 2))         self.counters['days'].set(round(str8.total_seconds() / (3600 * 24), 2))         self.counters['weeks'].set(round(str8.total_seconds() / (3600 * 24 * 7), 2))         self.counters['years'].set(round(str8.total_seconds() / (3600 * 24 * 7 * 52), 2))          self.after(1000, self.increment)   if __name__ == '__main__':     root = tk()     app = app(root)     root.title("str8")     root.resizable(width=false, height=false)     app.mainloop() 

a label can display text using text argument, or can display value tkinter variable doublevar using textvariable argument. cannot both. either use this:

lbl = label(self, text=measurement + ": ", font='verdana 8') lbl.grid(row=i+1, column=0, sticky=w) 

or this:

lbl = label(self, textvariable=self.counters[measurement], font='verdana 8') lbl.grid(row=i+1, column=0, sticky=w) 

edit: solution problem make own type of label can handle both:

import tkinter tk datetime import datetime  class formatlabel(tk.label):     '''a new type of label widget allows both text , textvariable'''     def __init__(self, master=none, **kwargs):         self.textvariable = kwargs.pop('textvariable', tk.stringvar(master))         self.text = kwargs.pop('text', '{}')         self.textvariable.trace('w', self.update_text)         tk.label.__init__(self, master, **kwargs)      def update_text(self, *args):         self.config(text=self.text.format(self.textvariable.get()))  class app(tk.frame):     def __init__(self, master=none, **kwargs):         tk.frame.__init__(self, master, **kwargs)          lbl = tk.label(self, text = 'you have been str8 for:', font="verdana 8 bold")         lbl.grid(row=0, sticky=tk.w)          self.counters = dict()         measurements = [ 'years', 'weeks', 'days', 'hours', 'minutes', 'seconds' ]          i, measurement in enumerate(measurements):             self.counters[measurement] = tk.doublevar()             lbl = formatlabel(self,                 text=measurement + ": {:.2f}", # set rounding here                 textvariable = self.counters[measurement],                 font='verdana 8')             lbl.grid(row=i+1, column=0, sticky=tk.w)             self.counters[measurement].set(0)          btn = tk.button(self,                text="exit",                font="verdana 8",                height=1,                width=19,                command=quit)         btn.grid(row=7, column=0)          self.increment()      def increment(self):         event = datetime(2017, 4, 4, 0, 0, 0)         today = datetime.now()          str8 = (today - event).total_seconds()         self.counters['seconds'].set(str8)         self.counters['minutes'].set(str8 / 60.)         self.counters['hours'].set(str8 / 3600.)         self.counters['days'].set(str8 / (3600. * 24))         self.counters['weeks'].set(str8 / (3600. * 24 * 7))         self.counters['years'].set(str8 / (3600. * 24 * 7 * 52))          self.after(1000, self.increment)  def main():     root = tk.tk()     app = app(root)     app.pack()     root.title("str8")     root.resizable(width=false, height=false)     app.mainloop()  if __name__ == '__main__':     main() 

note fixed other parts of code; notably should not use wildcard imports (from module import *), should not layout widgets on same line define them, , should try not repeat code.