Variables| Assignments| Identifiers in Python
In a program, a variable is a named item, such as x or num_people, used to hold a value.
An assignment statement assigns a variable with a value, such as x = 5. That statement means x is assigned with 5, and x keeps that value during subsequent statements, until x is assigned again.
An assignment statement's left side must be a variable. The right side can be an expression, so a statement may be x = 5, y = x, or z = x + 2. The 5, x, and x + 2 are each an expression that evaluates to a value.
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