System Scripting Lab 06

Python Basics

Setup

mkdir lab06
cd lab06
idle3

Python Interactive Examples:

5 + 6     # 11
4 * 2     # 8
6 / 4     # 1.5

Variables

x = 10
print(x)

# Print with text
print("Value of x is:", x)

Exercise 1: Variables

1. Valid Variable Names

• ❌ 8number (cannot start with number)
• ✅ b
• ✅ counter
• ❌ #tango (invalid character)
• ❌ "bed" (string, not variable name)
• ✅ NUMBER
• ✅ Android_phone1
• ❌ this variable (spaces not allowed)

2. Data Types

• a = False → bool
• b = 3.7 → float
• c = 'Alex' → str
• d = 7 → int
• e = 'True' → str
• g = '17' → str
• i = '3.14159' → str
• j = "---------add---------" → str

Exercise 2: Boolean Operators

Given:

a = False
b = True
c = False

Results:

• b and c → False
• b or c → True
• not a and b → True
• (a and b) or not c or (not b and not (a or c)) → True
• not ((not b or not a) and c) or a → True

Comparisons (x = 3)

• 1 < x → True
• x >= 4 → False
• x == 3 → True
• x == 3.0 → True
• "Hello" == "Hello" → True
• 4.0/2.0 == 2 → True
• 3 < 7 and 4 > 5 → False

Exercise 3: User Input Script

# Request user name
name = input("Enter your name: ")

# Request year of birth
year = int(input("Enter your year of birth: "))

# Calculate age (assuming current year = 2026)
age = 2026 - year

# Output message
print("Welcome", name)
print("You are", age, "years old")

Exercise 4: Formatted Output

print("Twinkle, twinkle, little star,")
print("How I wonder what you are!")
print("Up above the world so high,")
print("Like a diamond in the sky.")
print("Twinkle, twinkle, little star,")
print("How I wonder what you are")

Note: Repeat the block again to match required output.

Exercise 5: Single Print Multi-line Output

# Get user input
name = input("Enter your name: ")
age = input("Enter your age: ")
address = input("Enter your address: ")

# Print in one statement
print("Name:", name, "\nAge:", age, "\nAddress:", address)

Explanation:

• \n → New line character
• Single print used for multiple lines

Key Exam Tips

• Variable rules: No spaces, no starting with numbers
• Types: int, float, str, bool
• input() always returns string → use int() if needed
• Boolean logic is commonly tested
• == vs = → comparison vs assignment
• \n is essential for formatting
• Indentation matters in Python