Yes. It’s called a tuple. So, instead of [1,2] which is a list and which can be mutated, (1,2) is a tuple and cannot. Further Information: A one-element tuple cannot be instantiated by writing (1), instead, you need to write (1,). This is because the interpreter has various other uses for parentheses. You can also do away with parentheses altogether: 1,2 is the same as (1,2) Note that a tuple is … Read more
Use str.join:
One thing to keep in mind is that a tuple is immutable. This means that once it’s created, you can’t modify it in-place. A list, on the other hand, is mutable — meaning you can add elements, remove elements, and change elements in-place. A list has extra overhead, so only use a list if you need to modify … Read more
Your checkAnswer() function returns a tuple: Here return right, answer returns a tuple of two values. Note that it’s the comma that makes that expression a tuple; parenthesis are optional in most contexts. You assign this return value to right: making right a tuple here. Then when you try to add 1 to it again, the error occurs. You don’t change answer within the function, so there … Read more
Your output variable is not a N x 4 matrix, at least not in python types sense. It is a tuple, which can only be indexed by a single number, and you try to index by tuple (2 numbers with coma in between), which works only for numpy matrices. Print your output, figure out if … Read more
Well that is because according to the python doc Tuples are constructed by the comma operator (not within square brackets), with or without enclosing parentheses, but an empty tuple must have the enclosing parentheses, such as a, b, c or (). A single item tuple must have a trailing comma, such as (d,). so if … Read more
Tuples are compared position by position: the first item of the first tuple is compared to the first item of the second tuple; if they are not equal (i.e. the first is greater or smaller than the second) then that’s the result of the comparison, else the second item is considered, then the third and … Read more
Like the error message suggests, dictionaries in Python do not provide an append operation. You can instead just assign new values to their respective keys in a dictionary. If you’re wanting to append values as they’re entered you could instead use a list. Your line user[‘areas’].append[temp] looks like it is attempting to access a dictionary at the … Read more
You can use a generator expression: but parentheses were already taken for … generator expressions.