Myujth

I don't know how to solve this problem and have no idea why she appeared.

What to do to fix it?

Other people's similar problems are somehow related to the StringVar variable, I think this code is not the same error.

import matplotlib
from math import *
import pylab
from matplotlib import mlab
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
import tkinter as tk
from tkinter import ttk
from tkinter import *

g = 9.81

class MyData():
 v = IntVar()
 angle = IntVar()
 x0 = IntVar()
 y0 = IntVar()
 v2 = IntVar()
 angle2 = IntVar()
 x02 = IntVar()
 y02 = IntVar()
 v3 = IntVar()
 angle3 = IntVar()
 x03 = IntVar()
 y03 = IntVar()


class Fly(tk.Tk):

 def __init__(self, *args, **kwargs):
 tk.Tk.__init__(self, *args, **kwargs)

 tk.Tk.wm_title(self, "Fly")

 container = tk.Frame(self)
 container.pack(side="top", fill="both", expand=True)
 container.grid_rowconfigure(0, weight=1)
 container.grid_columnconfigure(0, weight=1)

 self.frames = 
 data = MyData

 for F in (StartPage, PageOne):
 frame = F(container, self, data)

 self.frames[F] = frame

 frame.grid(row=0, column=0, sticky="nsew")

 self.show_frame(StartPage)

 def show_frame(self, cont):
 frame = self.frames[cont]
 frame.tkraise()


class StartPage(tk.Frame):

 def __init__(self, parent, controller, data):
 tk.Frame.__init__(self, parent)
 label = tk.Label(self, text="Начальная страница")
 label.pack(pady=10, padx=10)

 button = ttk.Button(self, text="Visit Page 1",
 command=lambda: controller.show_frame(PageOne))
 button.pack()

 frame2 = Frame(self, borderwidth=4, relief=GROOVE)
 frame2.pack()

 first = Label(self, text='Данные для первого графика')
 first.pack()

 second = Label(self, text='Начальная скорость')
 second.pack()
 entry = Entry(self, width=10, textvariable=data.v)
 entry.pack()

 third = Label(self, text='Угол выстрела')
 third.pack()
 entry = Entry(self, width=10, textvariable=data.angle)
 entry.pack()

 fourth = Label(self, text='Начальная координата x')
 fourth.pack()
 entry = Entry(self, width=10, textvariable=data.x0)
 entry.pack()

 fifth = Label(self, text='Начальная координата y')
 fifth.pack()
 entry = Entry(self, width=10, textvariable=data.y0)
 entry.pack()

 frame3 = Frame(self, borderwidth=4, relief=GROOVE)
 frame3.pack()

 first = Label(self, text='Данные для второго графика')
 first.pack()

 second = Label(self, text='Начальная скорость')
 second.pack()
 entry = Entry(self, width=10, textvariable=data.v2)
 entry.pack()

 third = Label(self, text='Угол выстрела')
 third.pack()
 entry = Entry(self, width=10, textvariable=data.angle2)
 entry.pack()

 fourth = Label(self, text='Начальная координата x')
 fourth.pack()
 entry = Entry(self, width=10, textvariable=data.x02)
 entry.pack()

 fifth = Label(self, text='Начальная координата y')
 fifth.pack()
 entry = Entry(self, width=10, textvariable=data.y02)
 entry.pack()

 first = Label(self, text='Данные для третьего графика')
 first.pack()

 second = Label(self, text='Начальная скорость')
 second.pack()
 entry = Entry(self, width=10, textvariable=data.v3)
 entry.pack()

 third = Label(self, text='Угол выстрела')
 third.pack()
 entry = Entry(self, width=10, textvariable=data.angle3)
 entry.pack()

 fourth = Label(self, text='Начальная координата x')
 fourth.pack()
 entry = Entry(self, width=10, textvariable=data.x03)
 entry.pack()

 fifth = Label(self, text='Начальная координата y')
 fifth.pack()
 entry = Entry(self, width=10, textvariable=data.y03)
 entry.pack()


class PageOne(tk.Frame):

 def __init__(self, parent, controller, data):
 tk.Frame.__init__(self, parent)
 label = tk.Label(self, text="Generate")
 label.pack(pady=10, padx=10)

 button1 = ttk.Button(self, text="Поменять значения",
 command=lambda: controller.show_frame(StartPage))
 button1.pack()

 f = Figure(figsize=(5, 5), dpi=100)

 canvas = FigureCanvasTkAgg(f, self)
 canvas.show()
 canvas.get_tk_widget().pack(side=tk.BOTTOM, fill=tk.BOTH, expand=True)

 toolbar = NavigationToolbar2TkAgg(canvas, self)
 toolbar.update()
 canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=True)

 t = ((2 * data.v * sin(data.angle)) / g)
 vx = data.v * cos(data.angle)

 t2 = ((2 * data.v2 * sin(data.angle2)) / g)
 vx2 = data.v2 * cos(data.angle2)

 t3 = ((2 * data.v3 * sin(data.angle3)) / g)
 vx3 = data.v3 * cos(data.angle3)

 dx = 0.01
 xmin = data.x0
 xmax = vx * t * cos(data.angle)
 xmin2 = data.x02
 xmax2 = vx2 * t2 * cos(data.angle2)
 xmin3 = data.x03
 xmax3 = vx3 * t3 * cos(data.angle3)

 def func(x0, v, y0, angle):
 y = x0 * tan(angle) - (1 / (2 * v ** 2)) * ((g * x0 ** 2) / (cos(angle) ** 2)) + y0
 if y == 0:
 return 0.0
 return y


 def func2(x02, v2, y02, angle2):
 y2 = x02 * tan(angle2) - (1 / (2 * v2 ** 2)) * ((g * x02 ** 2) / (cos(angle2) ** 2)) + y02
 if y2 == 0:
 return 0.0
 return y2


 def func3(x03, v3, y03, angle3):
 y3 = x03 * tan(angle3) - (1 / (2 * v3 ** 2)) * ((g * x03 ** 2) / (cos(angle3) ** 2)) + y03
 if y3 == 0:
 return 0.0
 return y3


 xlist = mlab.frange(xmin, xmax, dx)
 xlist2 = mlab.frange(xmin2, xmax2, dx)
 xlist3 = mlab.frange(xmin3, xmax3, dx)

 ylist = [func(x0, data.v, data.y0, data.angle) for x0 in xlist]
 ylist2 = [func2(x02, data.v2, data.y02, data.angle2) for x02 in xlist2]
 ylist3 = [func3(x03, data.v3, data.y03, data.angle3) for x03 in xlist3]

 pylab.plot(xlist, ylist)
 pylab.plot(xlist2, ylist2)
 pylab.plot(xlist3, ylist3)

 pylab.show()


app = Fly()
app.mainloop()

Full error:

Traceback (most recent call last):
 File "C:/Users/Максим/PycharmProjects/test/test1.py", line 12, in <module>
class MyData():
 File "C:/Users/Максим/PycharmProjects/test/test1.py", line 13, in MyData
v = IntVar()
 File "D:Anaconda3libtkinter__init__.py", line 499, in __init__
Variable.__init__(self, master, value, name)
 File "D:Anaconda3libtkinter__init__.py", line 314, in __init__
self._root = master._root()
AttributeError: 'NoneType' object has no attribute '_root'

Is this error resolved or will I have to make another decision algorithm?

Just yesterday, I had another problem with global andnonlocal

You need to create the root widget before creating the IntVar object, please check here.