parcial3

Example Python program parcial3.py

Modules

• import sympy
• import tkinter

Classes

• class App(tkinter.Frame):

Methods

• def init(self, master):
• def run(self):

Code

Python tkinter example

import sympy
import tkinter


class App(tkinter.Frame):
    def __init__(self, master):
        super().__init__(master)
        self.grid()
        self.vrs = sympy.symbols(
            'lambda,mu,rho,rho_0,Nbar,sigma^2,Qbar,Wbar,Tbar')
        self.rels = [
            sympy.Eq(self.vrs[2], self.vrs[0] / self.vrs[1]),
            sympy.Eq(self.vrs[3], 1 - self.vrs[2]),
            sympy.Eq(self.vrs[4], self.vrs[2] / self.vrs[3]),
            sympy.Eq(self.vrs[5], self.vrs[2] / (self.vrs[3]**2)),
            sympy.Eq(self.vrs[6], self.vrs[4] - self.vrs[2]),
            sympy.Eq(self.vrs[7], self.vrs[6] / self.vrs[0]),
            sympy.Eq(self.vrs[8], self.vrs[4] / self.vrs[0])
        ]
        tkinter.Label(self, text="M/M/1").grid(pady=10)
        self.vars = []
        for var in self.vrs:
            frame = tkinter.Frame(self)
            tkinter.Label(frame, text=sympy.pretty(var) + ':').grid()
            self.vars.append(tkinter.StringVar())
            tkinter.Entry(
                frame, textvariable=self.vars[-1], width=20).grid(
                    column=1, row=0)
            frame.grid()
        tkinter.Button(self, text="Run", command=self.run).grid()

    def run(self):
        tmp = [(a, b) for a, b in zip(
            self.vrs, [float('0' + v.get()) for v in self.vars]) if b != 0]
        res = sympy.nonlinsolve([x.subs(tmp) for x in self.rels], self.vrs)
        for var, s in zip(self.vars, res.args[0].args):
            if s.is_Number:
                var.set(s)


root = tkinter.Tk()
app = App(root)
root.title("M/M/1")
root.mainloop()

Useful Links

• Articles: https://python-commandments.org/
• Python shell: https://bsdnerds.org/learn-python/
• Tutorial: https://pythonprogramminglanguage.com/