How can I fix this Error (Entry1 not defined)-CodePudding

I just started coding with Python and I can't find out how to fix the Error (NameError: name 'entry1' is not defined)

def forrangeright():
    entry1 = ttk.Entry(root, width=40)
    entry1.pack(padx=10, pady=10, side="bottom")
    confirmi_button = ttk.Button(root, text="Confirm", command=confirmichars)
    confirmi_button.pack(padx=10, side="bottom", fill="x")


def confirmichars():
    customichars = entry1.get() < --- Error
    Herre
    print(customichars)

CodePudding user response：

The issue here is with scope.

A variable created inside a function belongs to the local scope of that function, and can only be used inside that function. https://www.w3schools.com/python/python_scope.asp

Here you define entry1 in the local scope of the forrangerright() function meaning that outside of that function entry1 is undefined.

You can either define entry1 outside of a function as a global variable (bad practice)

Or return entry1 from the forrangerright() function and pass it to confirmichars()

Here is an example:

def forrangeright():
    entry1 = ttk.Entry(root, width=40)
    entry1.pack(padx=10, pady=10, side="bottom")
    confirmi_button = ttk.Button(root, text="Confirm", command=confirmichars)
    confirmi_button.pack(padx=10, side="bottom", fill="x")
    return entry1

def confirmichars():
        entry1 = forrangeright()
        customichars = entry1.get()   <--- Error Herre
        print(customichars)

or pass entry1 as an argument

def forrangeright():
    entry1 = ttk.Entry(root, width=40)
    entry1.pack(padx=10, pady=10, side="bottom")
    confirmi_button = ttk.Button(root, text="Confirm", command=confirmichars)
    confirmi_button.pack(padx=10, side="bottom", fill="x")
    return entry1

def confirmichars(entry1):
        customichars = entry1.get()   <--- Error Herre
        print(customichars)

CodePudding user response：

entry1.get() is set in your function forrangeright() but not in confirmichars()

If you want to access to entry1.get() in confirmichars() you need to add entry1.get() in the function parameter like this:

def confirmichars(entry1):
    customichars = entry1.get() < --- No Error Herre
    print(customichars)

Then you need to pass the argument so you can add a return to your function forrangeright() like this:

def forrangeright():
    entry1 = ttk.Entry(root, width=40)
    entry1.pack(padx=10, pady=10, side="bottom")
    confirmi_button = ttk.Button(root, text="Confirm", command=confirmichars)
    confirmi_button.pack(padx=10, side="bottom", fill="x")
    return entry1

Finally you can call your function confirmichars(entry1) like this:

entry1 = forrangeright()
confirmichars(entry1)