How can I set the default value of my slider to 100 ?

self.slider = tk.Sc开发者_开发百科ale(self.leftFrame, from_=0, to=256, orient=tk.HORIZONTAL, command=updateValue)

cursor=100?

If that doesn't work, you can always manually self.slider.set(100).

1. Set

Use the set method 1 2 : self.scale.set(100)

2. Variable

Use the variable option 3 4 to assign a Variable 5 6 7

self.scale_var = DoubleVar()
self.scale_var.set(1)
self.scale = tk.Scale(self.leftFrame, from_=0, to=256, orient=tk.HORIZONTAL,
    command=updateValue, variable=self.scale_var)

self.slider= tk.Scale(self.leftFrame, from_=0, to=256,orient=tk.HORIZONTAL,
command=updateValue)
self.slider.set(1)//or what ever value you want
self.slider.pack()

first give a name to scale then use set with value and at last pack()