Taxa de Juro Composto usando Tkinter

 

from tkinter import *

root =Tk()
class taxa_jurocomposto():
    def __init__(self):
        self.root = root
        self.janela()
        self.imagem()
        self.calcularjuros()
        root.mainloop()
    def janela(self):
        self.root.title("Taxa de Juro Composto")
        self.root.geometry("445x300")
        self.root.iconbitmap('moedas.ico')
        self.root.resizable(False, False)
    def imagem(self):
        self.bg = PhotoImage(file="juro.png")
        # Show image using label
        self.label1 = Label( image=self.bg)
        self.label1.place(relx=0, rely=0)
    def calcularjuros(self):
        # Montante
        self.montante = DoubleVar()
        self.lb_montante = Label(text="Montante", font=("Helvetica",'10'))
        self.lb_montante.place(relx=0.05, rely=0.05)
        self.montante_entry = Entry(textvariable=self.montante)
        self.montante_entry.place(relx=0.6, rely=0.05)
        # Prazo
        self.prazo = DoubleVar()
        self.lb_prazo = Label(text=" Prazo (anos) ", font=("Helvetica", '10'))
        self.lb_prazo.place(relx=0.05, rely=0.15)
        self.prazo_entry = Entry(textvariable=self.prazo)
        self.prazo_entry.place(relx=0.6, rely=0.15)
        #Vezes que é capitalizado
        self.capitalizacao = IntVar()
        self.lb_capitalizacao = Label(text="Período de Capitalização no Ano ", font=("Helvetica", '10'))
        self.lb_capitalizacao.place(relx=0.05, rely=0.25)
        self.capitalizacao_entry = Entry(textvariable=self.capitalizacao)
        self.capitalizacao_entry.place(relx=0.6, rely=0.25)
        # Taxa de Juro
        self.taxajuro = DoubleVar()
        self.lb_taxajuro = Label(text="Taxa de Juro (em %)", font=("Helvetica", '10'))
        self.lb_taxajuro.place(relx=0.05, rely=0.35)
        self.taxajuro_entry = Entry(textvariable=self.taxajuro)
        self.taxajuro_entry.place(relx=0.6, rely=0.35)
        # Butão de calcular a taxa de juro
        self.bt_calcular = Button(text="Calcular", bd=2, font=('verdana', '8', 'bold'), bg='gray18',
                                  fg='white',
                                  command=self.butao1)
        self.bt_calcular.place(relx=0.4, rely=0.45, relwidth=0.25, relheight=0.15)
         # Montante a Pagar no final
        self.montante_total = StringVar()
        self.lb_montante_total = Label(text="Montante Total",font=("Helvetica",'10','italic'))
        self.lb_montante_total.place(relx=0.05, rely=0.65)
        self.montante_total_resultado = Label(textvariable=self.montante_total,font=("Helvetica",'8'))
        self.montante_total_resultado.place(relx=0.5, rely=0.65)

        # Total de Juros
        self.total_juros = StringVar()
        self.lb_total_juros= Label(text="Total de Juros", font=("Helvetica", '10', 'italic'))
        self.lb_total_juros.place(relx=0.05, rely=0.75)
        self.total_juros_resultado = Label(textvariable=self.total_juros, font=("Helvetica", '8'))
        self.total_juros_resultado.place(relx=0.5, rely=0.75)

    def butao1(self):
        mon = self.montante.get()
        tx = self.taxajuro.get()
        pr = self.prazo.get()
        cpt = self.capitalizacao.get()
        txper = tx/100
        npow = pr *cpt
        t = (txper/cpt)+1
        n = pow(t,npow)
        vf = round((mon*n),2)
        j = round((vf-mon),2)
        return self.montante_total.set(vf), self.total_juros.set(j)


taxa_jurocomposto()