Python: الجمل الشرطية

if condition:
    code to execute when condition is True

age = 18
if age >= 18:
    print("You are an adult!")
    print("This is also inside the if block.")

print("This is outside the if and always executes.")

You are an adult!
This is also inside the if block.
This is outside the if and always executes.

score = 75

if score >= 60:
    print("Congratulations, you passed!")
    print(f"Your score is {score}.")

print("Score recorded.")

Congratulations, you passed!
Your score is 75.
Score recorded.

if condition:
    execute when True
else:
    execute when False

score = 45

if score >= 60:
    print("Passed!")
else:
    print("Failed, need to retake.")

Failed, need to retake.

password = "123456"

if password == "123456":
    print("Password correct, welcome back!")
else:
    print("Wrong password, try again.")
    print("If you forgot your password, click 'Forgot Password'.")

if condition1:
    execute when condition1 is True
elif condition2:
    execute when condition2 is True
elif condition3:
    execute when condition3 is True
else:
    execute when none of the above are True

score = 85

if score >= 90:
    print("Excellent!")
elif score >= 80:
    print("Good!")
elif score >= 70:
    print("Average.")
elif score >= 60:
    print("Pass.")
else:
    print("Failed, need to retake.")

# يُخرج: Good!

print("=== Today's Meals ===")
print("1. Braised Beef Noodles  $10")
print("2. Shredded Pork Rice     $8")
print("3. Tomato Egg Rice        $6")
print("4. Egg Fried Rice         $4")

choice = 3

if choice == 1:
    print("You ordered Braised Beef Noodles, $10.")
elif choice == 2:
    print("You ordered Shredded Pork Rice, $8.")
elif choice == 3:
    print("You ordered Tomato Egg Rice, $6.")
elif choice == 4:
    print("You ordered Egg Fried Rice, $4.")
else:
    print("Sorry, invalid option.")

print("Enjoy your meal!")

=== Today's Meals ===
1. Braised Beef Noodles  $10
2. Shredded Pork Rice     $8
3. Tomato Egg Rice        $6
4. Egg Fried Rice         $4
You ordered Tomato Egg Rice, $6.
Enjoy your meal!

age = 20
has_ticket = True

if age >= 18:
    print("Adult, can enter.")
    if has_ticket:
        print("Has ticket, please proceed.")
    else:
        print("Please buy a ticket first.")
else:
    print("Minor, entry denied.")

Adult, can enter.
Has ticket, please proceed.

# ❌ غير موصى به: تداخل كثير
user_input = "y"
is_admin = True
has_permission = True

if user_input == "y":
    if is_admin:
        if has_permission:
            print("Operation successful!")
        else:
            print("No permission.")
    else:
        print("Not an admin.")
else:
    print("Operation canceled.")

# ✅ موصى به: استخدم and لتقليل التداخل
user_input = "y"
is_admin = True
has_permission = True

if user_input != "y":
    print("Operation canceled.")
elif is_admin and has_permission:
    print("Operation successful!")
else:
    print("Insufficient permissions.")

# حساب الشحن بناءً على المنطقة والوزن ومستوى العضوية
region = "domestic"     # "domestic" أو "international"
weight = 3.5            # kg
is_vip = False

if region == "domestic":
    if weight <= 1:
        shipping = 10
    elif weight <= 5:
        shipping = 15
    else:
        shipping = 20
else:
    if weight <= 1:
        shipping = 50
    elif weight <= 5:
        shipping = 80
    else:
        shipping = 120

# VIP يحصل على خصم 20%
if is_vip:
    shipping *= 0.8

print(f"Region: {region}")
print(f"Weight: {weight}kg")
print(f"Shipping: ${shipping:.0f}")

Region: domestic
Weight: 3.5kg
Shipping: $15

# الطريقة العادية
age = 20
if age >= 18:
    status = "adult"
else:
    status = "minor"

# التعبير الثلاثي (سطر واحد)
status = "adult" if age >= 18 else "minor"

print(status)   # adult

value1 if condition else value2

# أخرج نتيجة بناءً على الدرجة
score = 88
result = "passed" if score >= 60 else "failed"
print(f"Exam result: {result}")   # Exam result: passed

# البحث عن القيمة الافتراضية
name = input("Enter your name: ") or "Guest"
greeting = f"Hello, {name}" if name else "Hello, Guest"
print(greeting)

if age >= 18:
    pass    # TODO: أضف منطق البالغين لاحقاً
else:
    print("Minor, cannot register.")

# استخدام في العالم الحقيقي
if user_age >= 18:
    register_user()      # تابع مع التسجيل
else:
    pass                 # لا معالجة خاصة للقصر حتى الآن