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Message: [QUOTE="Fdama, post: 5096898"] Hi, I was following an exercise in a book when I edited the code and came across something I did not get. Here is the relevant part of the code that works: start=None #initialise while start !="": start=input("\nStart: ") if start: start=int(start) finish=int(input("Finish: ")) print("word[",start,":",finish,"] is", word[start:finish]) I then changed the code to this: start=None #initialise while start !="": start=int(input("\nStart: ")) if start: finish=int(input("Finish: ")) print("word[",start,":",finish,"] is", word[start:finish]) I combined the int conversion and the input on the same line, rather than to have two different statements. But got an error message: Traceback (most recent call last): File "C:\Users\Faisal\Documents\python\pizza_slicer.py", line 23, in <module> start=int(input("\nStart: ")) ValueError: invalid literal for int() with base 10: '' Could someone tell me why I got this error message? Thanks [/QUOTE]