Empty Input line raises an error in Python 3.3 - python-3.3

Question

I'm new at Python and trying some exercises I found on-line. The one I'm busy with requires an text input first, folowed by an ineteger input.
I get stuck on the integer input which raises an error.
I've started by modifying the code slightly to test myself when I first got the error.
Eventually changed it backed to be exactly like the example/exercise had it, but both resulted in the same error, on the same line.
The error raised was:
Traceback (most recent call last):
File ************************ line 7, in <module>
numOfGuests = int(input())
ValueError: invalid literal for int() with base 10: ''
I've checked around a bit and found it get's triggered when the input is empty, but according to what I've read the the rest of the code should handle that.
numOfGuests = int(input())
if numOfGuests:
I expected the code to ask for the input again if nothing was entered, but get the error instead.
Much appreciated.

Answer 1

Update:
I've managed to figure out a work-around, and even though it isn't a answer to my question, I'll take it.
For anyone that's interested, here's what I did:
I changed:
numOfGuests=int(input())
to:
numOfGuests=input()
Only once something was entered did I convert it:
numOfGuests=int(numOfGuests)
so the final block is:
numOfGuests=''
while not numOfGuests:
print('How many guests will you have?')
numOfGuests = input()
numOfGuests=int(numOfGuests)
Any ideas to improve it, or some insight, would be appreciated.

Answer 2

I know this question is 10 months old but I just want to share the reason why you are having an error ValueError.
Traceback (most recent call last):
File ************************ line 7, in <module>
numOfGuests = int(input())
ValueError: invalid literal for int() with base 10: ''
Is because the input() function reads any value and convert it into a string type. Even if you try to input empty or blank.
Sample code:
any_input = input("Input something: ")
print(f"Your input is: [{any_input}]")
Ouput:
Input something:
Your input is: []
Then the blank or empty string will be passed inside the int() function. The int() function will try convert string into an integer with a base of 10. As we all know, there is no blank or empty numbers. That is why it is giving you a ValueError.
To avoid this, we need to use try-except/EAFP in your code:
try:
# Try to convert input to integer
numOfGuests = int(input("How many guests will you have? "))
except:
# Handle Value Error
And put inside a While-loop to repeat until input is valid.
Sample code:
while True:
try:
# Try to convert input to integer
numOfGuests = int(input("How many guests will you have? "))
# If input is valid go to next line
break # End loop
except:
# Handle Value Error
print("Invalid input!")
print(f"The number of guest/s is: {numOfGuests}")
Ouput:
How many guest will you have? 3
The number of guest/s is: 3