What is a variable in Python? How do you create variables and how does Python manage them?

What is a variable in Python? How do you create variables and how does Python manage them?
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Variable is a named reference to a value stored in memory.

You don’t declare the type of a variable. Python determines it at runtime.

Must begin with a letter (A–Z or a–z) or underscore (_).

Can contain letters, digits (0–9), and underscores.

Case-sensitive (name ≠ Name)
✅ Valid: my_var, _count, user2
❌ Invalid: 2user, my-var, for

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