How to check if user input is empty in Python

 When writing a program you need to think about errors the user can do and one of them is not entering anything when you ask to input something. I'll show show on two examples how to prevent it and print an error for user.

viteac.blogspot.com - Check if user input is emopty

 

You're asking user to input some data and want to store it in variable to use later but user of some reasons or by mistake can enter nothing and just press Enter. There's a few  ways to detect it.

Example 1:

	while True: # initiate infinite loop
	u_input = input('Enter: ')
	if not u_input: #if u_input is False
	print('Try again. Enter something')
	else: # otherwise print & break
	print(u_input)
	break

view raw Detect_if_user_input_is_empty_Python_viteac.blogspot.com.py hosted with ❤ by GitHub

Enter something: 
Try again.
Enter something: 
Try again.
Enter something: something
something

Process finished with exit code 0

Example 2:

	while True:
	try:
	u_input = input("Enter something: ")
	if not u_input:
	raise ValueError
	except ValueError as error:
	print('Error. Try again and enter something')
	else:
	print(f' This is what you entered: {u_input}')
	break

view raw check_if_input_is_empty_Try_Except_Python_viteac.blogspot.com.py hosted with ❤ by GitHub

Enter something: 
Error. Try again and enter something
Enter something: something
 This is what you entered:  something

Process finished with exit code 0

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