if / else — but faster, on one line

The problem...

You know how to write an if / else. It works. It's clear.

But sometimes four lines feel like a lot for a simple yes or no.

if score >= 60:
    result = "Passed"
else:
    result = "Failed"

Four lines. One decision. One variable. There's a shorter way.

The idea!

The ternary operator compresses a simple if / else into a single line.

result = "Passed" if score >= 60 else "Failed"

Same logic. Same outcome. One line.

The syntax

value = something if condition else something_else

Read it left to right: assign something — but only if condition is true — else assign something_else.

A few examples

age = 20
label = "Adult" if age >= 18 else "Minor"
print(label)    # Adult

temperature = 15
feeling = "warm" if temperature > 20 else "cold"
print(feeling)  # cold

is_logged_in = True
greeting = "Welcome back." if is_logged_in else "Please log in."
print(greeting) # Welcome back.

Use it — but don't abuse it

Ternary is clean when the condition is simple. It becomes a problem when you try to do too much.

# Fine — simple and readable
status = "on" if is_active else "off"

# Avoid — too much on one line, hard to read
result = "A" if score >= 90 else "B" if score >= 70 else "C"

The moment it gets hard to read — switch back to if / elif / else. Ternary is a tool, not a rule.

Common mistakes

# Wrong — condition at the wrong place
result = if score >= 60 "Passed" else "Failed"    # SyntaxError

# Wrong — trying to run code, not assign a value
if score >= 60 else print("Failed")               # SyntaxError

# Wrong — nesting ternaries
result = "A" if score >= 90 else "B" if score >= 70 else "C"
# works, but nobody wants to read this

Ternary assigns a value — it doesn't run blocks of code. And it doesn't replace elif.

Heads up!

• Ternary only works for simple if / else — no elif
• The condition goes in the middle — value if condition else other
• If it's hard to read on one line — use the full if / else instead
• Never nest ternaries — it's not clever, it's unreadable

The mindset shift

Stop thinking: "I need four lines for every decision."

Start thinking: "If it's simple enough to say in one sentence — write it in one line."

What you should understand now

• Ternary is a compressed if / else on a single line
• Syntax: value if condition else other_value
• Use it for simple binary decisions — not for complex logic
• Readability always wins — if it's unclear, use the full form