Python elif Statement

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Python elif Statement

Understanding the elif Keyword

In Python, the elif keyword stands for “else if”. It is used when you want to check multiple conditions one after another.

• If the first if condition fails, Python moves to the elif condition.
• As soon as one condition evaluates to True, its block of code runs, and the remaining conditions are ignored.

Basic Example of elif

Example: Comparing Two Numbers

x = 45 y = 60 if x > y: print("x is greater than y") elif x < y: print("x is smaller than y")

x is smaller than y

Explanation:

• The if condition checks whether x is greater than y.
• Since it is false, Python evaluates the elif condition.
• The elif condition is true, so the message is printed.

Using Multiple elif Conditions

You can include any number of elif statements in a decision-making structure. Python checks each condition in sequence and executes the first one that matches.

Example: Student Result Evaluation

marks = 68 if marks >= 85: print("Distinction") elif marks >= 70: print("First Class") elif marks >= 55: print("Second Class") elif marks >= 40: print("Pass")

Second Class

Output Explanation: The program evaluates conditions from top to bottom. Since marks is 68, the "Second Class" message is printed.

How elif Execution Works

Python follows these rules when using elif:

• Conditions are checked from top to bottom
• Only one block of code is executed
• Once a condition is true, the rest are skipped

Even if multiple conditions could be true, only the first true condition runs.

Example: Age-Based Classification

user_age = 32 if user_age < 12: print("Child category") elif user_age < 18: print("Teen category") elif user_age < 60: print("Adult category") else: print("Senior category")

Adult category

Why else is useful: It catches all remaining cases and ensures the program always produces output.

When Should You Use elif?

Use elif when:

• Conditions are mutually exclusive
• Only one outcome should be executed
• You want cleaner and more efficient logic

Using multiple if statements instead of elif can cause unnecessary checks.

Example: Menu Selection Program

option = 4 if option == 1: print("Start Game") elif option == 2: print("Load Game") elif option == 3: print("Settings") elif option == 4: print("Exit")

Exit

Explanation: Only one menu option is executed. Python stops checking after a match is found.

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