Variables are used to ____ data in programs. They can be ____ as the program runs. A variable has two main parts: 1. ____: The name used to reference the variable e.g. ____. 2. ____: The data the variable stores e.g. ____. To assign a value to a variable, you use the ____ operator ____ e.g. first_name = "Emily". Variable names can consist of letters, numbers, and ____. Variable names cannot start with a number or contain ____. It’s good practice to use ____ variable names that clearly describe the data they hold. Valid variable names include: student_age, ____, _score. Invalid variable names include: 1student, ____, user@name.

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