I need to show warning message if the username is not entered.

Question

Its like in the apps where when you click continue button without filling the field. It will show a message like ("username is required") like that.

Answer 1

Santhos raj ,

you can do it like this description:

▪︎use a variable and the input() function for storing the entered value
▪︎in next line check if variable is empty
▪︎in case of the variable is empty: use print to give an error message
▪︎if variable is not empty, continue with the next steps

if you want to give the user the possibility to repeat input in case of variable is empty, put a loop around these steps mentioned above. in this case make sure that the loop can be left if input is ok

happy coding and good success!

Answer 2

Santhos raj
use get() method for getting the text from entry widget.

from tkinter import*
root=Tk()
entry=Entry(text="hey")

def check():
print(entry.get())

button=Button(text="Submit",command=check)

entry.pack()
button.pack()
root.mainloop()

Answer 3

Use if statement
I = input()
If I:
print("continue")
else:
print ("name is required")

Answer 4

Santhos raj ,
You can also use the message box

Import tkinter.messagebox as tmsg

Tmsg.showalert("Alert", "dont enter empty username")

Answer 5

Lothar can you help me how to find if a variable is empty? I used len function but it showed that entry type has no len()

Answer 6

Santhos raj Here's a possible solution:

while True:
if name := input("ENTER: "): break
print("Please enter your name!")

# Hope this helps

Answer 7

Abhay so we need to get entry within the function?

Answer 8

Sudo thanks I will try that