Python Error: invalid literal for int() with base 10

Python, like other programming languages, is all about trial and error- and if you’re like the rest of us, you’ll probably get an error message more times than you can count. But error messages are fixable, and with this handy guide you’ll have a working program in no time.

What is this error?

The error message invalid literal for int with base 10 is triggered when you put a string argument into the int() function that isn’t a normal integer value. When the user uses a file to load data into the Python program, and the file does not have an integer in the right spot, you will see this problem manifest in the invalid literal for int with base 10 error message in your program.

Why am I seeing this?

This valueerror can traceback to an improperly entered string value, floating point value, or float value, into some sort of function int, that requires an integer. To answer this error message question, let’s consider all of the correct ways to pass values into such a Python function.

  • String representation of an integer to an integer.
  • String representation of a floating-point to a floating-point.
  • String representation of an integer to a floating point number.
  • Floating point value to an integer.
  • Integer object to a floating point number.

This means that trying to do a non integer value calculation, such as a string representation of a floating point, into a function that requires an integer, you will see this error message.

How can I fix it?

The first example solution you should try is ensuring that the input is actually a number or an integer, which can be done with the isdigit() function. If the input is not made up of a number or multiple digits, running it through the int() function will give you that value error message. Another method for fixing this problem is putting the string or input through the float() function. This will return a floating point number that will successfully work in the int() function as intended. Either of these variable methods will fix the issue, and are an acceptable answer to the integer object question that this error message poses. They can even be combined into int(float(“string”)) to fix the integer object error in one move.

This integer error message is fairly straightforward to understand, and its cause is very simple to find. Odds are, you’re just entering the wrong type of value into your function. It becomes a little bit harder when you are doing data input from a file, as the user may not always know if the file is formatted properly, but as long as you check that the right type of values are being used in the data, your calculation command should work just fine using this code function.