how to make entry box detect letters and give warning saying "numbers only"

Question

I am making a GUI tkinter program for a school assignment, which requires the user to enter name, and age, and then do a quiz, my problem is when they enter their age as a string it should say please enter a number but i get this error

_tkinter.TclError: expected floating-point number but got

this is the part which concerns the age input

def show_frame2(self):

   try:

        if self.name.get() == "":
            self.warning.configure(text = "Please enter your name")
            self.NameEntry.focus()
        elif self.name.get().isalpha() == False:
            self.warning.configure(text = "Please enter text")
            self.NameEntry.delete(0, END)
            self.NameEntry.focus()

        elif self.AgeEntry.get() == "":
            self.warning.configure(text = "Please enter a number")
            self.AgeEntry.delete(0, END)
        elif self.age.get() > 14:
            self.warning.configure(text = "You are to old")
            self.AgeEntry.delete(0, END)
        elif self.age.get() <= 0:
            self.warning.configure(text = "Please enter a number number other than 0")
            self.age_entry.delete(0, END)
        elif self.age.get() <= 7:
            self.warning.configure(text = "Sorry, You are to young")
        else:
            self.frame1.grid_remove()
            self.frame2.grid(row = 1, columnspan = 4)
            self.next_problem()

    except ValueError:
        self.warning.configure(text = "Please enter a number")
        self.AgeEntry.delete(0,END)
        self.AgeEntry.focus()

Relevant [Interactively validating Entry widget content in tkinter](https://stackoverflow.com/questions/4140437)a — stovfl, May 06 '20 at 07:31
***TclError: expected floating-point number but got***: [Edit] your question and show the full Traceback — stovfl, May 06 '20 at 07:35

score 0 · Accepted Answer · answered May 06 '20 at 05:07

0

You should change the except ValueError into except _tkinter.TclError.

This would fix your problem.

answered May 06 '20 at 05:07

10 Rep

2,217
7
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33

```During handling of the above exception, another exception occurred:``` i get this error, when i use that – nicetoknow95 May 06 '20 at 05:10
That's because of where the except is. – 10 Rep May 06 '20 at 16:24

score 0 · Answer 2 · answered May 06 '20 at 05:14

0

self.age should probably be changed to be a StrVar; then do the float conversion yourself:

try:
    age = float(self.age.get())
except (ValueError, TypeError):
    # ... appropriate warning

answered May 06 '20 at 05:14

Torben Klein

2,943
1
19
24

hey bro it now detects and gives message to type a number but a valid response dosnt get get accepted – nicetoknow95 May 06 '20 at 05:39

how to make entry box detect letters and give warning saying "numbers only"

2 Answers2