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elif Statement

AI & DATA SCIENCE // elif-statement

The elif statement (short for 'else if') lets you chain multiple exclusive conditions after an if, checking each in order until one is true.

Syntax

if condition1:
    ...
elif condition2:
    ...
elif condition3:
    ...

Deep Dive Course

elif exists so Python doesn't need nested if/else blocks for a chain of mutually exclusive conditions — each elif is only evaluated if every condition above it was falsy, and as soon as one condition matches, the rest of the chain, including any trailing else, is skipped entirely. This keeps multi-branch logic flat and readable instead of accumulating indentation with nested else-if blocks.

1Understanding elif Statement

💡

Order elif branches from most specific to most general, or most likely first for performance-sensitive hot paths — since evaluation stops at the first true condition, branch order changes which one actually runs when multiple conditions could match.

editor.html

score = 75
if score >= 90:
    grade = "A"
elif score >= 80:
    grade = "B"
elif score >= 70:
    grade = "C"
else:
    grade = "F"
print(grade)

localhost:3000

2Practical Example

Here is a real-world application of elif Statement showing how it is used in production Python code.

editor.html

status_code = 404
if status_code == 200:
    print("OK")
elif status_code == 404:
    print("Not Found")
elif status_code >= 500:
    print("Server Error")

localhost:3000

3Best Practices

Follow these guidelines when working with elif Statement:

1. Use elif instead of nested else-if blocks to keep multi-branch conditionals flat and readable

2. Order conditions so the most specific or most likely case is checked first, since only the first matching branch runs

3. Consider a dictionary of functions, a dispatch table, instead of a long elif chain when there are many possible cases keyed by a single value

⚠️

Tip: Order elif branches from most specific to most general, or most likely first for performance-sensitive hot paths — since evaluation stops at the first true condition, branch order changes which one actually runs when multiple conditions could match.

editor.html

score = 75
if score >= 90:
    grade = "A"
elif score >= 80:
    grade = "B"
elif score >= 70:
    grade = "C"
else:
    grade = "F"
print(grade)

localhost:3000

Examples

Example 01Basic Usage

score = 75
if score >= 90:
    grade = "A"
elif score >= 80:
    grade = "B"
elif score >= 70:
    grade = "C"
else:
    grade = "F"
print(grade)

Example 02Advanced Example

status_code = 404
if status_code == 200:
    print("OK")
elif status_code == 404:
    print("Not Found")
elif status_code >= 500:
    print("Server Error")

Best Practices

Use elif instead of nested else-if blocks to keep multi-branch conditionals flat and readable
Order conditions so the most specific or most likely case is checked first, since only the first matching branch runs
Consider a dictionary of functions, a dispatch table, instead of a long elif chain when there are many possible cases keyed by a single value

Interview Question

If two elif conditions in the same chain would both be true, which branch actually runs?▼

Hint: Think about how Python evaluates the chain.

Only the first branch whose condition is true runs — Python evaluates the if and each elif in order, top to bottom, and stops as soon as one is truthy, skipping every remaining elif and else in that chain, even if a later condition would also have matched. This means branch order matters whenever conditions could overlap.

Exercises

MediumPractice using elif Statement in a real scenario.

View Solution

score = 75
if score >= 90:
    grade = "A"
elif score >= 80:
    grade = "B"
elif score >= 70:
    grade = "C"
else:
    grade = "F"
print(grade)

Frequently Asked Questions

If two elif conditions in the same chain would both be true, which branch actually runs?▼

Related Functions

if-statementelse-statementdictionaries