Button in tkinter is calling a function before being pressed

Question

I am programming with tkinter in python 2.7. Used this syntax dozens of times but for some reason in this specific occurrence after I declare the button it calls the function without me pressing it.. here is the code:

def uninstall_win():
    verify = Tk()
    verify.title("Uninstall")
    recheck = make_entry(verify, "Please Re-enter password:", 14, show='*')
    b = Button(verify, borderwidth=4, text="Uninstall", pady=8, command=uninstall(recheck.get()))
    b.pack()
    verify.mainloop()

def make_entry(parent, caption, width=None, **options):
    Label(parent, text=caption).pack(side=TOP)
    entry = Entry(parent, **options)
    if width:
        entry.config(width=width)
    entry.pack(side=TOP, padx=10, fill=BOTH)
    return entry

any insight will be appreciated

score 2 · Answer 1 · answered May 30 '16 at 19:31

2

You should use lambda when putting a function with arguments in a Button.

b = Button(verify, borderwidth=4, text="Uninstall", pady=8, command=lambda: uninstall(recheck.get()))

answered May 30 '16 at 19:31

kushtrimh

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score 0 · Answer 2 · answered May 30 '16 at 19:31

0

Becuase you're calling the function instead of passing the function as a callable.

lambda: uninstall(recheck.get())

Passing uninstall(recheck.get()) is setting the command to be what this function returns

answered May 30 '16 at 19:31

Pythonista

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Button in tkinter is calling a function before being pressed

2 Answers2