If Statements: The Fork in the Road

In a real-world ledger, you don't treat every entry the same way. If an account is overdrawn, you flag it. If a payment is massive, you verify it. In Python, we use Conditional Statements (if, elif, and else) to control the flow of our program.

The Basic if Statement

The structure of an if statement is simple but strict. You provide a condition, followed by a colon (:). The code that follows must be indented (usually 4 spaces).

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Adding an else

What happens if the condition is False? We use the else block to provide a backup plan.

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The elif (Else If)

Sometimes you have more than two options. For example, a ledger might have "Positive," "Zero," and "Negative" states. We use elif to check multiple specific conditions in order.

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⚠️ The Golden Rule: Indentation

In Python, indentation isn't just for looks—it's part of the grammar. Everything indented under the if statement "belongs" to that decision. If you forget to indent, Python will throw an IndentationError.

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🏆 The Ledger Challenge: The Security Gate

You are writing a login check for The Python Ledger database.

Task:

1. Create a variable username and set it to a string.
2. Create a variable is_admin and set it to a Boolean.
3. Write an if/elif/else structure:
   • IF the username is "Admin" AND is_admin is True, print: "Full Access Granted."
   • ELIF the username is "Admin" but is_admin is False, print: "Admin access denied. Check permissions."
   • ELSE, print: "Standard User Access Granted."

Write your code below:

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📚 Deep Dive

• Python Docs: More Control Flow Tools
• Real Python: Conditional Statements in Python

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Next Steps

Congratulations! You've mastered the basics of logic. You are now ready for your first Project. We will be building a text-based adventure right inside our browser terminal.