These are words that have specific meanings to Python, such as if (which begins an if statement).
• Names are case-sensitive. num is different from num and num.
• By convention, most Python programmers use lowercase for names that stand for values. They use other rules for names that stand for functions and classes—you can find out more about these conventions in later chapters.
• It's a Good Idea to use meaningful names. If you name everything with a single letter, for example, you may have trouble remembering what the name stands for later.
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