Python supports explicit type conversion by converting values to different data types. In Python you can convert integers to strings, strings to integers, floats to integers but one conversion Python does not support a float as a string to an integer. In if you try to convert from float as an string to integer then it throw exception as “ValueError: invalid literal for int() with base 10“.

Example: ValueError: invalid literal for int() with base 10

Let’s take a below example where asking weight as input from user, as you know weight can be float value. In this example if user input weight more than 10 KG then user will get discount of 100 Rs. otherwise not discount.

sugar_weight = input("Enter how much sugar you want: ")

sugar_weight_as_int = int(sugar_weight)

if sugar_weight_as_int > 10:
    print("You have discount of 100/- Rs.")
else:
    print("You do not have discount on sugar.")

Output

Enter how much sugar you want: 6.5
Traceback (most recent call last):
  File "main.py", line 3, in <module>
    sugar_weight_as_int = int(sugar_weight)
ValueError: invalid literal for int() with base 10: '6.5'

In this example throw exception as “ValueError: invalid literal for int() with base 10: ‘6.5’” because here user insert the sugar weight as 6.5 which is float string value now to comparing with integer value type casting as int but Python doesn’t support type casting from float string to integer that’s why Python will throw exception as “ValueError: invalid literal for int() with base 10: ‘6.5’“.

If you noticed the above error messages have two parts:

1: ValueError: This error occured when there is an issue with the value stored in a particular object.
2: Error Message “invalid literal for int() with base 10: ‘6.5’” : This means the value we have passed through an int() method cannot be converted because the int() method does not allow you to pass a float represented as a string.

Solution

To resolve this issue, you should convert this passing float string value to float then this exception will get resolve because Python allows float string to float conversion.

sugar_weight = input("Enter how much sugar you want: ")

sugar_weight_as_int = int(float(sugar_weight))

if sugar_weight_as_int > 10:
    print("You have discount of 100/- Rs.")
else:
    print("You do not have discount on sugar.")

Output

Enter how much sugar you want: 6.5
You do not have discount on sugar.

Conclusion

In Python “ValueError: invalid literal for int() with base 10” error is occurred when you try to convert a string value that is not formatted as an integer. To overcome this issue you can use the float() method to convert a floating-point number in a string to an integer. Then, you can use int() to convert your number to an integer.

If this solution does not work, make sure the input value of a string does not contain any letters because Strings with letters cannot be converted to an integer unless those letters have a special meaning.

To learn more on exception handling follow the link Python: Exception Handling.

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