Variables: Labeling the Ledger

In the previous lesson, we printed text directly. But what if you want to use the same piece of information ten times? Or what if that information changes?

In Python, we use Variables to store data. Think of a variable as a labeled box. The box holds a value, and the label (the name) allows you to find that value whenever you need it.

The Assignment Operator

To put something in a box, we use the = symbol. In Python, this is called the Assignment Operator.

Important: This is NOT the same as "equals" in math. It means "Take the value on the right and store it into the name on the left."

Python Sandbox

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Reassignment: Updating the Record

The beauty of a variable is that it is variable - it can change. If you assign a new value to an existing name, Python throws away the old value and keeps the new one.

Python Sandbox

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Naming Your Variables (The Rules)

You can't just name a variable anything. Python has a few "laws of the land":

1. No Spaces: Use underscores instead (my_variable).
2. Start with a Letter: You cannot start a name with a number (e.g., 1_entry is illegal).
3. Be Descriptive: x is a bad name. user_balance is a great name.
4. Case Sensitive: Ledger and ledger are two different boxes.

In Python, the community standard is called snake_case (all lowercase with underscores).

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🏆 The Ledger Challenge: The Character Sheet

Let's use variables to build a mini "Character Sheet" for your coding journey.

Task:

1. Create a variable called coder_name and set it to your name.
2. Create a variable called coding_level and set it to 1.
3. Create a variable called favorite_language and set it to "Python".
4. Use a single print() statement (or multiple!) to show your stats.

Write your code below:

Python Sandbox

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📚 Deep Dive

Other resources:

• Geomar.de: Variables and Assignment
• Real Python: Variables in Python

Next Steps

Now that we have boxes to store information, we need to talk about the different types of stuff we can put inside them.