Conditionals

Use if, elif, else for decision making.

Ternary

x if condition else y

Truthiness

0, "", [], None, False are falsy.

Syntax

PYTHON

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score = 85
if score >= 90: grade = "A"
elif score >= 80: grade = "B"
else: grade = "F"

status = "pass" if score >= 60 else "fail"

Python Conditionals

PYTHON

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score = 85

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

print("Grade:", grade)

# Ternary
status = "Pass" if score >= 60 else "Fail"
print("Status:", status)

# Multiple conditions
age = 22
has_license = True
if age >= 18 and has_license:
    print("Can drive")

# In keyword
if "a" in ["a", "b"]:
    print("Found!")

Try It Yourself

Practice

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Exercise

Check if a number is positive, negative, or zero.

Answer

num = 10
if num > 0: print("Positive")
elif num < 0: print("Negative")
else: print("Zero")

Quick Quiz

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What is bool("")?

True

False

Empty string is falsy.

Retry Quiz

Interview Questions

What are guard clauses?

Early returns at function start that handle edge cases, reducing nesting.

Next Lesson

Loops