How to fix this? ValueError: invalid literal for int() with base 10 error in Python

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I am creating a program that reads a file and if the first line of the file is not blank, it reads the next four lines. Calculations are performed on those lines and then the next line is read. If that line is not empty it continues. However, I am getting this error:

ValueError: invalid literal for int() with base 10: ''.` 

It is reading the first line but can't convert it to an integer.

What can I do to fix this problem?

Nov 16, 2018 in Python by Anirudh
• 2,060 points
7,416 views

1 answer to this question.

0 votes

The following are totally acceptable in python:

  • passing a string representation of an integer into int
  • passing a string representation of a float into float
  • passing a string representation of an integer into float
  • passing a float into int
  • passing an integer into float

But you get a ValueError if you pass a string representation of a float into int, or a string representation of anything but an integer (including empty string). If you do want to pass a string representation of a float to an int, as @katyhuff points out above, you can convert to a float first, then to an integer:

answered Nov 16, 2018 by Nymeria
• 3,500 points

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