Python: Errors when working with variables

The order of instructions in code with variables is of great importance. That's why the variable must be defined before you use it for the first time. Below is an example of a mistake often made by beginners:

print(greeting)
greeting = 'Father!'

Running the program above ends with the error NameError: name 'greeting' is not defined - this is a reference error. This means that the code uses a name (identifier) that hasn't yet been defined. This is stated in the text of the error itself: 'greeting' is not defined. In addition to incorrect ordering, when working with Python, you can also come across simple typos in the name of the variable. This happens both when the variable is used and when it's declared.

You can reduce the number of such errors if you use a properly configured editor. It warns of possible problems and highlights variables that are used without being declared.

Instructions

Find an undeclared variable in the program and declare it by assigning the value 'Dragon' to it.

After running the program, the result on the screen should look like this:

Targaryen
 and
Dragon

Definitions

• Variable a way to save information and name it for later use in code.