Tkinter over VNC and TypeError: takes no arguments (1 given)

[oliver]

Hi i am making a code that controls a robot from VNC
firstly can i run tkinter over VNC and secondly when i press the button (when you press it it goes to the forwards command) i get an error which says

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TypeError: forwards() takes no arguments (1 given)

what can I do to stop this?
and if I can't run my code over VNC how else can I control it with a graphical interface?

This is the code

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from Tkinter import *
import tkMessageBox
import RPi.GPIO as gpio
import time
gpio.setwarnings(False)

gpio.setmode(gpio.BOARD)
gpio.setup(7, gpio.OUT)
gpio.setup(11, gpio.OUT)
gpio.setup(13, gpio.OUT)
gpio.setup(15, gpio.OUT)

gpio.output(7, False)
gpio.output(11, False)
gpio.output(13, False)
gpio.output(15, False)

def forwards():
    gpio.output(7, True)
    gpio.output(11, False)
    gpio.output(13, True)
    gpio.output(15, False)

def left():
    gpio.output(7, True)
    gpio.output(11, False)
    gpio.output(13, False)
    gpio.output(15, True)

def right():
    gpio.output(7, False)
    gpio.output(11, True)
    gpio.output(13, True)
    gpio.output(15, False)

def backwards():
    gpio.output(7, False)
    gpio.output(11, True)
    gpio.output(13, False)
    gpio.output(15, True)


def stopProg(e):
    root.destroy()
def login():
    if u.get() == 'p' and p.get() == 'p':
        distance_var = 'this will be added later'
        size = 512
        stealthmodevar = StringVar()
        root = Tk()
        root.title('Robot Controller')
        top.destroy()
        commandlineframe = Frame(root, width=size, height=size)
        commandlineframe.grid(row=0, column=1)
        piliteframe = Frame(root, width=size, height=size)
        piliteframe.grid(row=0, column=0)
        padup = Canvas(root, height=200, width=512)
        padup.create_rectangle(206, 100, 306, 200, fill='blue', width=0)
        padup.create_polygon(256, 0, 356, 150, 156, 150, fill='blue', width=0)
        padup.bind('<Button-1>', forwards)
        padup.grid(row=1, column=1)
        #piliteframe section
        pilitetext = Label(piliteframe, text = 'Pi-Lite text entry')
        pilitetext.grid(row=0, column=0)
        piliteentry = Entry(piliteframe)
        piliteentry.grid(row=0, column=1)
        pilitepicture = Label(piliteframe, text = 'Pi-Lite pictures')
        LCDtext = Label(piliteframe, text = 'LCD display text')
        LCDtext.grid(row=2, column=0)
        LCDtext1 = Label(piliteframe, text = 'LCD display text')
        LCDtext1.grid(row=3, column=0)
        LCDent = Entry(piliteframe)
        LCDent.grid(row=2, column=1)
        pilitepicture.grid(row=1, column=0)
#make the camera frame
        cameraframe = Frame(root, height=size, width=size)
        cameraframe.grid(row=1, column=0)
        #make the buttons
        lengthent = Entry(cameraframe)
        lengthent.grid(row=1, column=3)
        length = Label(cameraframe, text='Video Length')
        length.grid(row=1, column=2)
        video = Button(cameraframe, text = 'Record Video')
        video.grid(row=1, column=1)
        stealth = Checkbutton(cameraframe, text='Stealth Mode', variable=stealthmodevar, onvalue='Y', offvalue='N')
        stealth.grid(row=0, column=0)
        photo = Button(cameraframe, text='Take Photo')
        photo.grid(row=1, column=0)
        distance = Label(cameraframe, text='Distance from Robot:')
        distance.grid(row=2, column=0)
        distancelabel = Label(cameraframe, text=distance_var)
        distancelabel.grid(row=2, column=1)
      #  quitroot = Button(cameraframe, text='Quit')
    #    quitroot.grid(row=3, column=0)
     #   quitroot.bind('<Button-1>', stopProg)
        root.mainloop()
    else:
        tkMessageBox.showwarning('Incorrect Username or Password', 'You have typed in your Username or Password incorrectly please try again')

#create window
top=Tk()

top.title('Login')
top.configure(background='yellow')
#make the username label
username = Label(top, text='Username:', bg='yellow')
username.pack()
#make the username entry widget
u = Entry(top)
u.pack()
#make the password label
password = Label(top, text='Password:', bg='yellow')
password.pack()
#make the password entry widget
p = Entry(top)
p.pack()
#make the login button
login = Button(top, text='Login:', command=login, fg='white', bg='red')
login.pack()

top.mainloop()

Thanks in advance,
Olly

[DirkS]

Regarding this error

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TypeError: forwards() takes no arguments (1 given)

With binding to a function the function always has one argument ('event') (see e.g. http://effbot.org/tkinterbook/tkinter-e ... ndings.htm for an example)

So you function definition should look something like

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def forwards(event):
    gpio.output(7, True)
    gpio.output(11, False)
    gpio.output(13, True)
    gpio.output(15, False)

Gr.
Dirk.