Python ValueError occurs in python when there is a problem with the information/value assigned to a variable. It is not a complex error as it can be identified and solved fast.
Following cases are some reasons for this error:
1)Applying a data type operation on different data type
Ex: applying operations of integer on string or converting string into integer.
2)Unpacking more values from a list or tuple than the variables we have.
Ex: When we try to unpack 3 elements in list to 4 variables.
3)Trying to perform an operation on a value which does not exist.
Ex: Trying to remove a value from an empty list.
This error can be solved by debugging the code or they can be avoided by using try and exception handling.