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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 five 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?
Thanks in advance.
The error message invalid literal for int() with base 10 would seem to indicate that you are passing a string that’s not an integer to the int() function . In other words it’s either empty, or has a character in it other than a digit.
You can solve this error by using Python isdigit() method to check whether the value is number or not. The returns True if all the characters are digits, otherwise False .
if val.isdigit():
The other way to overcome this issue is to wrap your code inside a Python try…except block to handle this error.
Python2.x and Python3.x
Sometimes the difference between Python2.x and Python3.x that leads to this ValueError: invalid literal for int() with base 10 .
With Python2.x , int(str(3/2)) gives you “1”. With Python3.x , the same gives you (“1.5”): ValueError: invalid literal for int() with base 10: “1.5”.